Castiel

Castiel is a powerful angel of the Lord, who was responsible for pulling Dean Winchester out of Hell, on God's command. It was his job to help prevent Lilith from breaking the 66 Seals that, once broken, would release Lucifer from his cage. Once Castiel learned that the angels wished to free Lucifer, he defied his angelic brethren and died trying to help Dean prevent Sam Winchester from breaking the last seal.

After he was killed by Raphael, Castiel was resurrected by God and appointed as the Winchester brothers' protector to prevent them from becoming the vessels of Michael and Lucifer. When the Apocalypse was averted, he was again resurrected with new powers, being promoted to Seraph. He then started a civil war in Heaven to prevent Raphael from restarting the Apocalypse. Thinking he couldn't be outsmarted by a demon, Castiel teamed up with Crowley to claim the souls of Purgatory. He ended up betraying Crowley and absorbed all the souls, resulting in his powers reaching the level that of a god, but at a high price: the powers that the evil souls granted him had warped Castiel's mind, causing him to proclaim himself as the new God.

Castiel later agreed to the advice of Dean to release the souls back into Purgatory. While seemingly successful, it turned out that the most powerful entities from Purgatory held on to Castiel, and overpowered and took control him. When the Leviathans leave to take over new forms Castiel was presumed dead, but survived - apparently resurrected by God yet again. Dean later accidentally finds Castiel as an amnesiac healer called Emmanuel. After taking on Sam's madness and experience in Hell in order to save the Winchester and redeem himself for what he did to Sam, Castiel had become insane and fell into a coma. However, he awakens and his sanity is returned to an extent when a signal was sent to all angels upon the discovery of the Word of God and the appointment of a new prophet. He then aides the Winchester brothers against Dick Roman, only to be transported to Purgatory with Dean.

While Dean returns, Castiel is not with him. While his condition is initially unknown, it's revealed that he spent most of his time running from Leviathans and that he didn't escape Purgatory with Dean as he had planned to stay as a form of penance. However, he was eventually released from the monster realm by an incursion of angels under the orders of a mysterious but powerful angel named Naomi and would rejoin the Winchester brothers and tried to become a hunter himself.

But after a long while, Castiel learned that Naomi has been conrtolling him ever since she got him out of Purgatory and compelling him to find the angel tablet, at any cost, even going as far as killing Dean. When he almost did so, Castiel's connection with Dean broke Naomi's control over him. After that, Castiel then teamed up with Metatron when the angel convinced him to help him close the gates of Heaven. So after collecting the heart of a nephilim and the bow of cupid, Metatron is eventually captured by Naomi but escapes and kills her, only for Cas to discover Metatron's betral and plan to cause all angels in Heaven, even the imprisoned ones, to fall to Earth.

So after being stripped of his grace, which was the last trial to cause the angels to fall, Castiel spends the next three months on Earth as a human, from living on the streets, to becoming a Gas Station Clark, and even being a posed-FBI agent to try and help his Fallen siblings. But when he is captured and tortured by an angel named Malachi, Castiel steels the grace on another angel and returns to has status as an angel.

Appearance
As an angel, experiencing Castiel's true form will result in blindness, deafness, or even death, as the appearance of his natural visage is so overwhelming that it is capable of burning human or demon eyes from their sockets (as seen in Lazarus Rising), as he said, "My true form. It can be overwhelming to humans. So can my real voice." However, Castiel stated certain, "special people" are able to tolerate his true appearance and voice. Although his true form has never been seen, it is known that he has two feathered wings. When Castiel was a seraph, he describes himself as a "multidimensional wavelength of celestial intent" and his true form is "approximately the size of your Chrysler Building" in height. As he was promoted to a Seraph, it stands to reason his true form has changed to one of a Seraph's. It is presumed to be very tremendous and terrifying, as the mere image of it was enough to cause Crowley to flee in fear of being smited.

For humans, they see him as the appearance of his vessel, Jimmy Novak, who is an average man in his thirties. He sports a pair of dress shoes, a black suit, a buttoned white-striped dress shirt, and loosened blue necktie accentuated by a beige trench coat. Although he has a very dire demeanor, his outward appearance radiates a natural calm and serenity which makes conversation easy and direct. He occupied Jimmy's body because he had prayed for it. Since his third resurrection, his appearance has changed. He lost his trench coat upon his third death and when he became amnesic, he wore different clothes. Upon regaining his memories, Dean gave him back his trench coat, but he still wore Emmanuel's clothes until he became insane. Now that he's insane he wears his trench coat and hospital scrubs. While in Purgatory he retained the same outfit, albeit extremely dirty and torn off. Castiel also grew a beard and his hair became messier. After returning from the monster realm, Castiel returned to his original appearance, with his suit and trench coat. He kept this until he lost his grace and became human. While he initially kept his usual clothes, they became dirty and he was unable to clean them and get food and water so he abandoned the trenchcoat and suit and took to wearing more casual human clothes, though he did wear a suit when he pretended to be an FBI agent. After becoming an angel again, Castiel donned a new suit and trenchcoat, but didn't wear a tie like before.

Castiel also possessed Jimmy's daughter, Claire Novak, for a brief time when Jimmy was still undecided if he would take back the angel. It would appear that Castiel could possess any willing member from Jimmy Novak's bloodline, not unlike how Michael was able to possess John Winchester, and three of his sons. Castiel indicated that he could possess Sam Winchester as well if he had his permission.

Personality
Castiel is strong, determined, impulsive, competitive, ignorant and naive. Like most angels, Castiel expresses little to no emotion which creates a lot of flaws and complexities in his persona. Despite this, he does not display the blank apathy or mocking superiority complex that seem to characterize angels such as Uriel or Lucifer. His lack of emotion and understanding of human traits such as sarcasm has often led to humorous situations throughout the show and have occasionally almost gotten him into trouble with humans, ultimately leaving Dean or Sam to amend the situation. He does, however, become close friends with the brothers, who encourage him to be kinder, more caring and more selfless.

Unlike some of his brethren, Castiel still has faith in his father, though not to the near zealot-like level displayed by Michael. While he admits he may not always understand what God wants and question the reason for it, he would always follow his father to the best of his abilities. This, along with his interest in humans, has caused other angels to label him as odd or naive, but also peculiar. Anna and Lucifer have both demonstrated this, with Anna calling him a hypocrite for refusing to rebel in order to gain more freedom. Castiel loses this faith after Joshua reveals that God doesn't care and briefly falls into a depression, however, when God resurrects him for a second time, it returns. Castiel frequently exhibits what could be referred to as friendly affection towards Dean, and seems to at the very least come close to expressing regret, hesitance, and anger several times.

Being around the Winchesters and his own experiences in the War have taught Castiel several "tricks" that have helped him during the show. While not possessing free will in the same sense as a human, Castiel has learned how to "bend" the rules at times in season 4. The best example is when he informs Dean about Chuck's archangel thereby giving Dean the idea to use him to save Sam from Lilith (The Monster at the End of This Book). He also is able to distract Meg long enough to use her and a similar trick Uriel performed to free Alastair to free himself from a ring of holy fire (Abandon All Hope). It is also possible he learned from the demon Crowley to wipe out loyalists of his adversary, Raphael. Castiel also considers himself to be the Winchester's personal guardian angel. Castiel developed more of a bond with Dean than with Sam (as he said they have "profound bond"). This bond allowed Dean to break Naomi's control on Castiel and possibly contributed to his turn from pacifism.

When Castiel is brought back from the dead after Lucifer kills him, he begins to develop a sense of pride. During Season 6, Castiel's personality begins to change, notably being more prideful. It is also because of this pride that Castiel makes a deal with Crowley, and starts the civil war in heaven. During this time Castiel showed extremely high ambition, using all he could do to open the door of Purgatory. He also became very intellegent, capable of tricking Dean, Sam, Raphael, and even Crowley, who was noted of his intellegence.

Upon absorbing the souls, Castiel claimed to be the new God, though later Death refers to him only as a mutated angel. Previously acting kind and assuring but also fierce at times, Castiel had now become nearly purely cold and absolute in his decisions, as seen when he kills Raphael without any second thoughts. Mere seconds later, he demanded that Dean, Bobby, and Sam kneel before him and and be by his side or he will destroy them if they forgot their place and rise up against him. However, he still had some lingering affection for them, leaving them alone, though he lost this when they tried to kill him by binding Death. When he realized that he was out of control and that the Leviathans were influencing him, apparently at least somewhat responsible for the new personality, Castiel returns to his original personality with a lot of guilt and goes to his friends for help. Knowing Dean is furious with him for breaking Sam's wall and all that he has done, Castiel expresses true remorse for his actions and swears to do all he can to make up for what he did in Dean's eyes.

After his third resurrection, Castiel lost his memories and took on a more human personality, though he was still more distant than normal humans. He expressed affection for his wife Daphne Allen and retained his desire to help people as shown by the fact that when he rediscovered his healing powers, he used them to heal people in need, also showing great compassion. While shocked by the existence of demons, he took it relatively well once it was explained to him. He was perceptive enough to realize that Dean couldn't forgive "Cas" for what he had done and felt betrayed and that he himself was the Cas mentioned after overhearing some of Dean's conversation with Meg. In his human mindset, he had no idea of what he was capable of and was nervous with the idea of using his powers to kill demons when he had no idea how. However, despite this, he displayed courage in agreeing to try and seemed to still possess an instinctual knowledge of how to use them as he quickly figured out what to do.

After recovering his memories, Castiel's normal personality more or less returned, and he was overcome with guilt over what he had done, how many he had killed, and for releasing the Leviathans, even questioning why he was still alive. Following his awakening, his personality was greatly modified, due to a combination of what he had taken from Sam and his own guilt. It made him inattentive, overly calm, uncaring and seemingly dim. He also became a pacifist, and refused to fight, even when being attacked, as well as being overly optimistic, perceiving many negative things in a positive way. During this time he developed a unique relationship with Meg, a demon, as she was his caretaker during his insanity. He showed open attraction to her, calling her a "thorny beauty". Although Meg doesn't return the feelings at the start, a year later she openly flirts with Castiel, and Castiel seemingly returns the attraction. In Survival of the Fittest, Castiel explains that his pacifism comes from being afraid of causing more damage with his actions. However, he agrees to break his pacifism and help stop the Leviathans, possibly out of loyalty to Dean as he agrees after Dean says he'll likely die trying to stop them. After agreeing, he doesn't hesitate to fight, helping to dispatch Royce and getting in front of Dean to protect him from Dick Roman and later restraining the Leviathan leader so Dean can kill him. Castiel also displays a bleak view on his resurrections: instead of believing it to be a gift from God for his service, he now sees his resurrections as punishment for his actions, telling Dean "I see now its a punishment resurrection, it gets worse every time."

After he and Dean were sent to Purgatory, his sanity and original personality was restored, although he himself states nobody could ever be sure if he is indeed sane. Following his return in A Little Slice of Kevin, Castiel displayed a slightly more laid-back personality and a much less detached persona and showed human emotions as well as a taste for human things, as he commented how he missed watching televison. He has also developed a strong desire for penitence, looking for anyway possible to redeem himself for the devastation he caused Heaven and his fellow angels. But after all Castiel seems to be somewhat cowardly to take full responsibility for his actions against heaven, for example: to save himself he killed the Angel Hael and flees the scene, after she threatened him to tell the other angels about his whereabouts. However, he may have also killed her to prevent her from possessing him and causing him to lose his identity.

Since becoming human briefly, Castiel has become more human. He expresses more of an appreciation for human things and develops more human emotions such as romantic attraction. He also became less serious, drinking a beer with Sam and Dean and joking around. He proved to be good enough at being human that he was able to fool law enforcement and pose as an FBI agent, something he could never do successfully before even with coaching from Dean. Even after becoming an angel again, Castiel hasn't seemed to lose his human emotions, getting very angry when he realized who Gadreel was and freely expressing it and comforting a distraught Dean, understanding why he was so upset rather than being confused as he would have been in the past. While briefly human, he was ready to embrace his new status, excited to have Sam and Dean as his teachers and seemed to see his return to being an angel as a necessary evil more than something he wanted and his stealing of the grace of Theo as barbaric and something that made him as bad as the other angels. Castiel also seems to now understand human ways better, able to drive and steal a car, a skill he never previously showed, though he still lacks full knowledge of everything as he didn't know to get gas. He also developed a taste for human food, something that was made harder by the return of his angel powers and completely lost any former disgust he had towards Sam, finally understanding why he'd done everything he did. Castiel also learned that the ends don't justify the means when it means sacrificing lives.

Castiel seems to have a fondness for his usual appearance as he never changed until he briefly believed he was human. At first he may not have changed out of lack of necessity, but after returning from Purgatory, he put back on his usual outfit and was very pleased to be able to do so. He seemed to be particularly fond of his trenchcoat as even insane he wore it and was seen to only reluctantly let it go when as a human he was unable to afford to cleaning it. After becoming an angel again, he donned a new trenchcoat and suit, once again displaying his fondness for that particular attire.

Early life
"You know, I've...I've been here for a very long time. And I remember many things. I remember being at a shoreline, watching a little gray fish heave itself up on the beach and an older brother saying, 'Don't step on that fish, Castiel. Big plans for that fish.' I remember the tower of Babel...all 37 feet of it, which I suppose was impressive at the time. And when it fell, they howled divine wrath. But come on. Dried dung can only be stacked so high. I remember Cain and Abel...David and Goliath...Sodom and Gomorrah."

- Castiel, explaining his early life

Although not much is known about Castiel's early life, discussions with Uriel suggest the pair were children by Angel standards when Lucifer rebelled against Heaven and refused to bow down to humanity. While his brother was enthralled by Lucifer's power and charisma, Castiel remembered being frightened and disturbed by the rebellious Archangel. Castiel had been stationed on Earth for at least 2,000 years while being in the same garrison as Anna Milton, who acted as his superior, and Uriel. Castiel was present when the world was first created, making him (Biblically) several thousand years old (Uriel also made reference to questioning 'How long have I served' as '6 or 7 centuries'). He watched as the first fish emerged from the ocean. He also watched them build the Tower of Babel, among other historic and Biblical events, which possibly makes him billions of years old.

In 2008, Castiel speaks with his true vessel, Jimmy Novak, in Pontiac, Illinois. When Jimmy is watching television, Castiel's voice distorts the picture and causes him to scream in pain and his body to spasm until he finally blacks out. Later, Castiel would tell Jimmy to put his in arm in boiling water and that he would be unharmed as a way to prove his faith. With his wife believing that he was going crazy, Jimmy asks Castiel what he wants from him and how he can help. Castiel explains that he needs to use Jimmy as a vessel, to which Jimmy agrees to as long as his family is protected. After receiving consent, Castiel possesses Jimmy. Before he leaves, Castiel is confronted by Jimmy's daughter, Claire, and tells her that he is not her father.

Season 4
When Dean Winchester broke the first of the 66 Seals that would allow Lucifer to walk free, the Angels took action. They fought their way to Hell and Castiel freed Dean from the pit. Dean awoke in a grave and made his way to the surface, not knowing how he had been resurrected; the only clue he had was a large imprint of a hand near his shoulder. After reuniting with Bobby Singer and Sam Winchester, Dean tried to learn what had rescued him from Hell. He also discovered that he'd been dead and buried for four months. Eventually, Dean took matters into his own hands and with Bobby's help, set a trap for the creature and protected himself and Bobby with multiple Devil's Traps and other anti-demon devices. Castiel arrived and the hunters shot at him as he passed through the Devil's Traps with ease. Dean stabbed him with Ruby's knife but it had no effect and Castiel quickly knocked out Bobby with a mere touch. Castiel explained who he was to Dean, telling him "I'm an angel of the Lord.", and that God has work for him.

After people who were supposed to be dead seemed to be rising from the grave, Castiel appeared to Dean and explained to him that this was one of the 66 Seals, "The Rising of the Witnesses." Castiel told him that Lilith was attempting to break 66 of the seals which would lead to Lucifer walking free on Earth and then the Apocalypse would begin. The Angels had been fighting to stop the demons, but the odds were against them. He explained to Dean that he must help stop the breaking of the seals as well. Castiel also showed that he was not a force to be underestimated or even taken lightly as in a chilling tone, he told Dean to start showing him some respect or he'd change his mind and throw him back into Hell again.

One day when Dean was asleep, he woke up to find Castiel sitting beside him. Castiel, without speaking, tapped Dean and brought him back in time to an important few-day period. It showed Dean the connection between Azazel and Mary Winchester, and answered questions that had always been on his mind. Castiel said that the reason he had brought Dean back to that period was to make sure that he was caught up with all of the facts. He also explained that the angels are still unaware of Azazel's endgame. Castiel also told Dean about Sam's developing abilities and that he was going too far down a dark path and that if Sam did not stop using his powers, then the angels would kill him.

Sometime later, Castiel and his partner Uriel met with the Winchesters when they were in the middle of hunting a witch. The angels explained that the witch was trying to summon the demon Samhain from Hell and that this was another one of the 66 Seals. The angels said that they would have to destroy the entire town and all of its residents to ensure that the seal would not be broken. The brothers argued against this and assured Castiel and Uriel that they could stop the witch from summoning Samhain. While Uriel wanted to smite the town anyway and drag Dean and Sam away, Castiel agreed with them, later discussing with Uriel his disdain for humanity and their true orders. Unfortunately, the Winchesters failed and Samhain rose, breaking another seal. After Sam exorcised Samhain with his powers and stopped him, Castiel met with Dean in a park and revealed that the angels true orders were always to follow Dean's orders, not to smite the town and that this was a test of Dean's battlefield leadership. Castiel reveals that he always hoped that Dean would chose to save the town whether or not they failed and that he secretly harbors doubts about Heaven and its plans.

When the angels learned that a woman named Anna Milton could listen in on angel's conversations they grew worried. If the demons were able to get to her before them, the demons would know everything that the angels were planning. But Castiel knew the truth: Anna had once been an angel, a superior to him who disobeyed. She cut out her Grace and fell to Earth, where she was reborn as a human. Castiel and Uriel knew though that the only way to ensure the safety of their plans were to kill Anna. While Castiel was hesitant about this, Uriel enforced the idea that it was absolutely necessary.

Castiel and Uriel found Anna along with the Winchesters. The angels ordered Sam and Dean to hand over Anna, but they refused. The angels attacked them and almost retrieved Anna, but were sent away by a ritual Anna performed. They later were able to find Anna with the Winchesters again, but soon discovered that they had been led into a trap when Alastair arrived with a group of demons. The angels and demons fought over who would take Anna with Castiel fighting Alastair. Castiel proved no match for the demon, with his powers being useless, but Dean saved him despite being on opposite sides of the Anna situation. In the end, Anna retrieved her Grace and became an angel again and Alastair's body was destroyed, defeating him. Grateful for Dean saving him, Castiel held Uriel back from attacking Dean in revenge and they left to chase after Anna.

When Alastair tried to break another seal by killing two Reapers on the night of the Solstice, Castiel managed to capture him having pretended to be Bobby to send the Winchesters after the seal. The angels held Alastair captive and when seven angels had mysteriously been killed, Castiel assumed that demons were behind the attacks. He and Uriel recruited Dean to interrogate the demon. During the interrogation, Anna returned and spoke with Castiel. She told him that she knew how he was feeling and that he was beginning to develop human emotions. Castiel refused to believe this and yelled at her, causing her to leave. Shortly after, the Devil's Trap Castiel had made to hold Alastair somehow malfunctioned and Alastair nearly killed Dean. Castiel fought the demon but was almost defeated when Sam came to his rescue, using his psychic powers to kill Alastair to Castiel's shock after torturing out of him that the demons weren't responsible for the angel deaths. While visiting Dean at the hospital, Sam criticized Castiel for being so cold-hearted as to risking Dean's life. This sunk into Castiel's head and he went to Anna for help, telling her he needed to know what to do; she told him it was time for him to decide on his own for once. Castiel investigated the broken Devil's Trap further and learned that it was Uriel who was behind the malfunctioning Devil's Trap and the angel killings.

Uriel reminded Castiel of the times when Lucifer was one of the greatest angels and also spoke about how God isn't doing anything and they must follow someone who would. Castiel refused and the two angels fought. Castiel was no match for Uriel and was beaten down but was saved when Anna appeared and killed Uriel with his own Angel Blade. Castiel then went to Dean and confirmed that Dean was responsible for breaking the first seal by giving in to Alastair's torture. Dean begged Castiel to find someone else because he wasn't fit to stop the Apocalypse.

Castiel later appeared when Dean interrogated Chuck Shurley, who was writing a book series based on the Winchester brothers, explaining that Chuck was a Prophet of the Lord. When Dean asked him for help in saving Sam from Lilith, Castiel was initially hesitant to help, but dropped him a hint by telling him that Prophets are protected by archangels, and that if a Prophet is in the same room with a demon, then the archangel will descend to smite the demon.

Castiel then came to Dean while he was dreaming and told him to meet him at a certain location, saying that he had something to tell them. But when Dean and Sam arrived, they found him unconscious in a wrecked building with dead demons. When he awoke, the brothers found that Castiel had abandoned his vessel, Jimmy Novak, who describes being possessed by Castiel like "being chained to a comet." When Dean, Sam, Jimmy and Jimmy's daughter, Claire, were being held hostage by demons, Jimmy was shot and Castiel returned to possess Claire and helped save them all. While Castiel tried to comfort a dying Jimmy, Jimmy pleaded with Castiel to take him back as a host and Castiel accepted. When Dean asked Castiel what happened, he coldly replied, "I learned my lesson while I was away, Dean. I serve Heaven; I don't serve Man. And I certainly don't serve you."

Later in When the Levee Breaks Castiel was summoned by Dean, who was screaming for three hours for help. When Castiel arrived, Dean asked him what happened in Heaven, but Castiel wouldn't say. Then Castiel recruited Dean in the service of God and his Angels. Castiel told him to wait till the Angels summons him. A few hours later he freed Sam from Bobby's panic room in which he was held captive, because of his addiction. Later Anna confronted Castiel about why he released Sam. Anna said that Sam was even worse than they had expected. Castiel told he has his orders to follow and then said to Anna that she shouldn't have come. The next moment two Angels stood beside her, and took her captive.

Later Zachariah brought Dean to a chamber, so he would be safe for the release of Lucifer. Zachariah told him that the final seal would be broken that night. Although had a fight with Sam, Dean tried to contact him on his cellphone, leaving a message on his voicemail. Later Dean wanted to talk with Sam and summoned Castiel by breaking a Stone Angel on one of the tables. Dean asked to visited Sam, but Castiel said he could go everywhere except to Sam. Dean asked what they were going to do with Sam. Castiel said that Sam is going to do it to himself, but he didn't want to say more. He said it was his destiny. Dean said that destiny was just a bunch of lies, to keep him in line. Dean tried to persuade Castiel to help him, but Castiel said that they would be all be hunted, that they would all be killed. In response, Dean said to him that this is worth dying for. But to Dean's disappointment, Castiel refused and Dean ordered him away. Castiel tried to get Dean to listen, but left when he refused.

Shortly after, Castiel confronted Dean and drew an Angel Banishing Sigil on the wall with his own blood after putting his hand over Dean's mouth to stop him from shouting until he realized Castiel was helping him. Then Zachariah appeared and asked what he was doing. Castiel pressed his bloody hand on the sigil, banishing Zachariah. He then said that Lillith is the final seal and that Sam is going to break it. He said he knew someone that knew where Sam was and teleported Dean with him.

Castiel teleported Dean and himself to Chuck, the prophet of the Lord. Chuck was confused and said that this is not supposed to be, that they were not in the story. Castiel said that they would make it up. When they found out that Sam was at Saint Mary's, Chuck’s computer goes off and bright light fills the room. Castiel said it is the Archangel and teleported Dean to Saint Mary's, so that he could hold the Angel off. At Chuck’s, Castiel looks up at the bright light. Chuck puts his hand on Cas’s shoulder, and when Castiel gives him a look, he removes it.

Season 5
After witnessing the release of Lucifer from Hell, Dean and Sam go to Chuck's house to find Castiel. There they are told by Chuck that the Archangel smoked Castiel - literally - and they even find one of his teeth tangled in Chuck's hair. Later, when the Winchesters are trying to track down Michael's sword in their father's old storage unit, Zachariah and his angels arrive to inform Dean that he is Michael's sword—in other words, Michael's vessel. When Dean refused to give his consent for Michael to possess his body, Zachariah started inflicting various kinds of physical pain on him and Sam (breaking Sam's legs and removing his lungs, and giving Dean stage-four stomach cancer), all the while refusing to kill them. Castiel then miraculously appeared and dispatched Zachariah's men, then forced Zachariah to heal the Winchesters and leave. He then used his powers to carve Enochian Sigils on their ribs, keeping them hidden from all demons and angels, including Lucifer.

After rebelling against the angels, Castiel's powers began to deteriorate whilst he searched for God using Dean's amulet. However, despite his vanishing strength, he continued to be invaluable to the brothers saving them on numerous occasions.

Looking for a way to find God, Castiel approaches Dean to help him capture Raphael to interrogate him about God's location. After Castiel retrieved Holy Oil for the trap, Dean took him to a strip club after learning that Castiel was a virgin so he wouldn't die as one. Castiel was clearly nervous in the strip club and ended up angering the stripper by telling her that her father left because he hated his job, not her. Castiel and Dean succeeded in trapping Raphael who told them God was dead. Though Raphael demanded his release and threatened them, Castiel left him where he was telling him that "for now your my little bitch." Castiel later contacted Dean about finding The Colt and rescued him from Zachariah after he returned from the future. After seeing a future where Castiel was human and perpetually stoned, Dean told him never to change.

After Sam and Dean got kidnapped by the Trickster, Castiel came to their rescue, but was stopped. He later made his way back long enough to warn them that the Trickster was too powerful to be a Trickster before the Trickster himself appeared, greeted Castiel amicably then effortlessly overpowered him. Castiel's information and various clues caused Sam and Dean to realize the Trickster was actually the Archangel Gabriel and after trapping him, forced him to bring Castiel back from wherever he'd put him. Castiel greeted his brother coldly and watched the end of Sam and Dean's confrontation with him, doing nothing to help him.

When Sam, Dean, Ellen and Jo went after Lucifer, Castiel joined them, drinking shots with Ellen before they took off and taking a picture with the group. In Carthage, Castiel separated from the group to follow a Reaper and was captured and held in Holy Fire by Lucifer who tried to convince the angel to join him. Castiel refused and was held captive by Meg who taunted him. However, Castiel managed to loosen a pipe and use it to knock Meg into the circle where he tried to smite her only to find he'd lost that power. Castiel used Meg's body as a bridge to escape and teleported Sam and Dean, the only other survivors of the failed mission away from Lucifer.

When the brothers are ambushed and killed by several hunters furious with them for causing the Apocalypse, Castiel warns the brothers that Zachariah is looking for them in Heaven and they should attempt to contact an angel named Joshua, who is rumored to speak to God. When the brothers return from death, Sam reveals that God wants nothing to do with them, causing Castiel to abandon his belief in God and return Dean's amulet, stating that it's worthless. He falls into a depression and drinks heavily, but sobers up in time to help defeat the Whore of Babylon.

In Point of No Return, Castiel is angry with Dean's decision to say Yes to Michael as he had sacrificed everything to follow Dean as he believed in him. At one point Castiel beats him up out of pure rage. When Sam and Dean go to rescue Adam Milligan from Zachariah, Castiel carves an Angel Banishing Sigil into his chest and uses it to banish four angels and himself after showing his lack of faith in Dean by saying at least he won't have to see Dean fail. However, Dean ultimately doesn't go through with saying Yes to Michael and kills Zachariah instead.

In Two Minutes to Midnight, Castiel returns powerless, apparently from the banishing sigil. He apologizes to Dean for doubting him and comes to their aid when confronting Pestilence. In his weakened state, Pestilence easily brings Castiel down, but he possesses just a "speck" of his angelic self left, just enough to resist Pestilence's power long enough to cut off his ring and defeat him. Castiel later joins Bobby and Sam in an assault on Niveus to stop the Croatoan Virus, bemoaning his lack of power. Despite this, Castiel does a good job, stopping a truck loaded with the virus from leaving and killing a zombie with a shotgun (which he remarks is actually useful), saving Sam's life.

In Swan Song, now apparently fully human, Castiel accompanies Bobby, Dean and Sam to Detroit where Sam will say Yes to Lucifer as part of their plan. Castiel awkwardly says goodbye to Sam and tries to reassure him that they will be okay, but is bad at it. When Sam fails to overpower Lucifer, Castiel loses hope and suggests they get drunk and wait for the end to come. Dean refuses to give up and manages to get Castiel and Bobby to help him. In the final confrontation, when Michael (in the vessel of Adam Milligan) was about to fight Lucifer (in the vessel of Sam) Dean intervened saying he wished to speak with Sam. This prompted Michael to remove Dean, however, before he could respond Castiel threw a molotov of holy fire at Michael sending him back to Heaven for a brief time. Lucifer turned to Castiel, furious by the fact that Castiel harmed his brother, and caused Castiel to explode. Shortly after the battle between Sam and Lucifer, Castiel was resurrected by God with his angelic powers restored and upgraded, allowing him to restore Bobby Singer to life. Castiel, now a Seraph, said that he needed to return to Heaven to restore order to the anarchy that will follow Michael's departure.

Season 6
After the Apocalypse was averted, Castiel returned to Heaven where other angels awaited him. He tried to tell them about freedom, but none of them understood. Castiel finds out that the archangel Raphael wanted to take over and follow Michael's departure and restart the Apocalypse. Unable to stop him, Castiel wants to turn to Dean, but can't. Then Crowley shows up with a deal to find Purgatory and offers Castiel power to stop Raphael. So Castiel begins a civil war in Heaven. When Sam and Dean found out the plagues were unleashed upon the Earth, they called Castiel for help. Castiel showed up and told them the Angelic Weapons were stolen from Heaven. He also claimed that he didn't know what or whom brought Sam back from Hell.

During their investigation, they find out that an Angel has been moonlighting as a crossroads demon. To locate the angel's name, Castiel performed a ritual to find the angel that bought the soul. When Castiel learned it was his old friend, Balthazar, an angel follower of Raphael showed up and attacked Castiel. Castiel managed to defend himself and let the angel get away, but the angel knew that Balthazar was selling pieces of the Staff of Moses. So Castiel, Dean and Sam try to find Balthazar first, and when they do, Balthazar admitted that he stole the weapons from Heaven and that he want to live in freedom. When Balthazar disappears, Castiel is confronted by angels who want to kill him. Castiel asked them to join him, but they refused and Castiel killed them. Afterwards, Raphael showed up and told him that they were his followers and smashed Castiel. Just as Raphael was about to kill Castiel, Balthazar showed up and used the weapons from Heaven to destroy Raphael's vessel. Eventually, Sam and Dean showed up and were able to trap Balthazar in a circle of holy oil, but Castiel lets Balthazar go after they force him to let go of his hold on the soul with Castiel's reason being that he owed Balthazar his life.

Dean becomes more and more disturbed by Sam's behavior, and prays for Castiel's help. Castiel doesn't respond until Dean calls him about a possible loose nuke, much to Dean's aggravation. Castiel apologizes, but reassures Dean on his theory that Sam is not Lucifer, explaining that all angels would feel his presence if Lucifer was free. Castiel also states he doesn't know what's wrong with Sam, but he promises to make inquiries. Dean calls on Castiel once he has Sam unconscious, and asks for him to diagnose Sam. Castiel informs both brothers that physically, Sam is perfectly healthy, but his soul is missing. He guesses that Sam's soul is still in the cage with Michael and Lucifer. When Sam goes with Samuel as his only lead, Castiel follows Sam and Dean to the Campbell Compound to check if Samuel has a soul or not, which he does. However, before he can do any more to help, he states he needs to return to Heaven, but reassures Sam and Dean that their problems "always come first", and will keep in touch.

Castiel is later called on for assistance by Sam, who tricks him into leaving Heaven by saying he and Dean have found the Ark of the Covenant. Sam tries to coerce Castiel into joining them along with the demon Meg and her minions to confront Crowley, but fails as Castiel knows Sam can't harm him. However, recignizing that Sam really does need help, Castiel decides to help anyway. Castiel tries to track down Crowley by means of a ritual, which leads them nowhere. When the group is caught by Samuel as they search through his quarters, Dean asks for the angel to leave back to their motel.

Sometime later, while Sam and Dean are looking through records trying to find Crowley, Castiel is confounded by watching porn, which he states just happened to be on the TV. He creates an awkward moment, even weirding Samuel out upon arriving at their motel. He leaves with the group after Samuel gives them the location of Crowley's prison. Before leaving for the prison, Castiel suggests to Dean that he doesn't think restoring Sam's soul is wise. He supports his statement with the fact that his soul has been locked in the cage with Michael and Lucifer for more than a year, and they have been doing nothing other than taking their frustrations out on Sam. He theorizes that if they try to force the damaged, tortured soul back into Sam, and if they fail to deal with the problems, then Sam will suffer horrifically.

The group then leaves for the prison, and Castiel finds a back entrance inside. Shortly after, hell-hounds come after the party. Meg distracts Castiel by kissing him, and steals his angelic blade. Castiel, surprisingly, responds to this by kissing her back, stating he learned that from the porn he was watching earlier. The boys then run off while Meg holds off the hell-hounds with the angel blade. Later, Castiel is banished by a blood sigil cast by Samuel, while the Winchesters are taken captive.

While Crowley has the boys pinned to the wall, Castiel reappears, carrying a large bag. After Crowley taunts him about his losing war against Raphael, Castiel reveals that the bag contains his salvaged bones. The angel asks the King of Hell one last time if he can restore Sam's soul or not. Crowley says he cannot, and Castiel proceeds to burn his bones, turning him to ash.

A short moment later, outside the prison, Castiel later admits that he is on the losing side of the civil war in Heaven, and expresses disappointment as he wishes much of the time that circumstances were different as he prefers being on Earth with Sam and Dean. Dean then reassures the angel that they will help in whatever way they can, and that the brothers are his friends. Castiel then turns to Sam, and reassures him that they will find another way to get his soul back. Sam then asks him to dispose of the monsters that still remain inside the prison, to which Castiel presumably leaves to do so.

After Sam gets his soul back, Castiel comes to check up on him, and tells Dean that he doesn't think Sam is ever going to wake up. A few hours later Sam wakes up and reunites with his brother. Later on Sam, now with his soul, calls Cas. Castiel comes and tells Sam he is glad to see him well, despite everything, nearly hugging him. Sam catches on and tricks Castiel into telling him the truth.

In My Heart Will Go On, Castiel saves Sam and Dean from Fate, when she tries to get her revenge for stopping the apocalypse. He tells the brothers if they want to live, they need to kill Fate. So Sam and Dean draw Fate out and just as they face their death, time freezes. Castiel confronts Fate and she reveals the real reason why Balthazar saved the Titanic. It was because Castiel ordered Balthazar to do it for the souls. She threatens to kill Sam and Dean unless Castiel fixes history. Castiel orders the creeping Balthazar to stop and right history.

In Frontierland, Cas returns to send Sam and Dean back to the Wild West so the brothers could acquire ashes of the phoenix, the one thing that could kill the mother of all. He tells Sam and Dean they have only 24 hours, after that he will no longer be able to find them. During the time the boys are in the Wild West, Castiel's lieutenant, Rachel, confronts him about his side dealings Castiel is doing to win the war. This leads to a duel between the two, and Castiel emerges the winner and wounded. He soon heads to Bobby's, draws a symbol in his blood and passes out. As time grows short, Castiel re-awakens, but is very weak and low on power. In order to "power up" he tells Bobby he needs to touch Bobby's soul. Once powered up, Castiel brings the boys back.

Now with the ashes, the hunt for Eve is on. Castiel comes to Sam and Dean asking for Eve's location, but they too are unsuccessful. Sam suggests that they find a monster who would be willing to give them Eve's location. Castiel finds and brings Lenore, who gives them Eve's location, in exchange for her death. Sam is hesitant, but Castiel brings Lenore her end. This action makes Sam and Dean concerned about Castiel and his circumstances. Once they arrive in Oregon, Castiel discovers he can't use his powers, and is now powerless, thanks to Eve. Castiel is able to torture Eve's location out of a Jefferson Starship, but is captured by her monsters. After Dean kills Eve, Castiel's powers return and he slays the Jefferson Starships with a blast of white light. Castiel is later revealed to be working with Crowley after the Winchesters' encounter with Eve.

The truth finally comes out in The Man Who Would Be King, Castiel recounts history from his point of view and how the Winchesters inspired him. Castiel also begins to notice that Sam, Dean and Bobby are getting suspicious of Castiel and believe he is working with Crowley. Castiel recounts about his return to heaven and his favorite place (the heaven of a 40 year old man who drowned in a bath tub). This is after him bringing back Sam from hell, sans his soul.



At the time, Castiel did not know Sam didn't have his soul. He also tries to get other angels to embrace freedom, but the angels don't know how. Then Raphael tries to make Castiel bow to him, and Castiel refuses. Due to his misfortune, Castiel is no match for him. Castiel tries to get help from Dean, but seeing Dean retired makes Castiel rethink this. Then Crowley approaches Castiel with a deal, so Cas can become more powerful. Castiel begins his deal with Crowley. With this deal, Castiel starts the civil war in heaven. But when Crowley begins to threaten the Winchester's lives, Castiel becomes protective of them. Although Castiel managed to keep the secret for a while, he slipped up with information he got from spying on them. Later the boys trapped him in a ring of holy fire and confront him about his betrayal. When demons come, Castiel tells the boys to run and they leave him in the ring of holy fire. Crowley comes in and saves him. Castiel leaves, and comes to Dean, trying to explain the situation. Castiel tells Dean that he did this for Dean but Dean does not want it this way. Castiel responds that Dean can't stop him and says he's sorry and disappears.



In Let It Bleed, Castiel has taken one of the Campbell diaries, and is investigating an incident in which H.P. Lovecraft opened a portal to another world. Sam prays for him, telling Cas that Lisa and Ben have been kidnapped by Crowley, and asks for help. Castiel listens unseen, and does not answer, but goes to confront Crowley. He insists that the demon not harm Lisa and Ben, but Crowley refuses to make such a promise. Balthazar later calls him. He asks Cas if he is planning on opening the door to Purgatory; Cas lies that he is not, but Balthazar is not fooled. Castiel asks if he is with him, or not. Balthazar says he is.Castiel goes to Dean, arriving just in time to save him from a demon. He apologizes for Lisa and Ben, revealing that he did not know Crowley's plan. Dean is skeptical, and angry. Castiel asks him again to support his decision to tap the souls in Purgatory. He pleads with him that he has always done what the brothers needed him to, asking little in return. Cas asks them to trust in him, and promises to bring him his family afterward. Dean is unwilling, and Castiel leaves. After Dean and Sam rescue Lisa, Castiel comes to the hospital where the gravely injured Lisa is not expected to survive. He apologizes again, but Dean is not forgiving. Castiel says that he did not come for Dean, then places a hand on Lisa's forehead, healing her. Both Dean and Cas acknowledge that this does not change their situation, but Dean asks for an additional favor. Castiel removes all Lisa and Ben's memories of Dean. Later Castiel finds and takes Dr. Visyak, the creature he needs to open Purgatory.

In The Man Who Knew Too Much, Castiel and Crowley torture Dr. Visyak until they obtain what they need to open Purgatory. She escapes and contacts Bobby and the Winchesters, telling her story before dying in an alley from her injuries. Castiel comes to the three hunters, who are outraged. Dean tries to argue with him again, but Cas cuts him off, saying he no longer cares about Dean's opinion. He then touches Sam's head, breaking the mental wall, and promising to repair him as long as Dean stops the opposition.

Castiel meets with Crowley, who has assembled the necessary ingredients. The angel wants to renegotiate their deal. He will not give Crowley the souls, so Crowley can either flee or die. The demon leaves Castiel with the blood for the ritual. Later, Castiel confronts Balthazar. He says that Dean is coming, and someone among them is a traitor. Balthazar asks him who it is, and Castiel lies that he does not know, and wants Balthazar to investigate. While the other angel is distracted, Castiel stabs and kills him. Just before the ritual is meant to begin, a cloud of demons descends around the building, and Crowley appears. Castiel tries to kill him, but cannot. He has a new partner in Raphael. Castiel is surprised at the partnership with their differing goals, but both seem to think they have taken the best course available. They demand the blood; Castiel throws them a jar and leaves. Crowley conducts the ritual, and though Bobby and Dean try to interrupt, completes it.

Nothing happens and Castiel reappears. Crowley realizes that he switched the blood, and conducted his own ritual. Castiel displays his power briefly in a flash of energy. Crowley, realizing the game is up for the time being, wisely disappears, and Raphael asks for mercy.

But Castiel is not in a forgiving mood. He snaps his fingers, obliterating Raphael to pieces in mere seconds. He turns to Dean and Bobby. He was right, he says, and he did save them. Dean nervously agrees, then suggests that Castiel should return the souls, and disarm himself. Castiel says he has Raphael's followers to deal with. Dean is worried, and reminds Castiel that he is family, and he doesn't want to lose him. Castiel says that he has no family anymore; he will not give up the souls.

Using that moment, Sam stabs him from behind with an angel sword, but nothing happens. Castiel greets him, then says the sword will not work because he is not an angel anymore. He says that he is their new God, and that they must venerate him, or be destroyed. As he says those words, Dean, Sam and Bobby look on in horror, realizing with shock that their former ally and friend has become a power-hungry angel who believes that he is God.

Season 7
Castiel waits for Sam, Dean, and Bobby to show their respects. Bobby goes to his knees, and motions for Sam and Dean to do the same. Dean and Sam begin to kneel, but Castiel stops him, and orders Bobby to stand, saying that there is no point if they do not mean what they do. Castiel observes, without turning to look, that Sam is not doing well. Dean reminds Cas that the former angel promised to fix Sam when it was over. Castiel cuts him off; his promise was contingent on Dean not opposing him further, and oppose him Dean did. Castiel tells them he has no need to kill them, though he no longer has any regard for them, and will let them live if they do not plot against him.

Castiel sets out to right the wrongs he sees. He destroys Raphael's followers in Heaven, and tells the angels that he no longer thinks free will is what Heaven needs. Instead, he will give them a firm hand. He appears in a church, reveals his identity, and smites a hypocritical preacher. He leaves an image of himself in the stained glass as he departs, and accidentally burns a pew as welts appear on his hand.

He finds Crowley hiding in a RV, and tells him that he may retain his position as King of Hell, but that Castiel will choose which souls he receives. He leaves after looking at yet more open places on his skin. He gives money to a blind man on the street, and heals the man for his faith. The man is grateful, but surprised when his first sight is of Castiel's blistering face.

At a nearby bathroom, he looks in the mirror and stares at the blisters covering his face and hands. His stomach begins to bulge and contort as the Leviathans demand to be let out, whispering to him as he looks down in horror, mumbling "No."

Sam, Dean, and Bobby summon Crowley, who reluctantly gives them a spell to bind Death. They work it, and an irritated Death appears, followed shortly by Castiel. Dean orders Death to kill 'god'. Death says he sees only a mutated angel, one whose vessel is disintegrating. Castiel, sounding uncertain, says he will heal himself when his works are complete. Death replies that Castiel swallowed Leviathans when he emptied Purgatory, not just souls, and that is the danger. Castiel frees Death from Dean's binding spell.

Castiel leaves. At a political election office campaigning for a senator of whom Castiel disapproves, he is stopped by one of her aides. Castiel asks the man to see that he is a good god, that he means the best for his children. He awakes some time later in a pool of blood on the floor. He has slaughtered the entire office. At Bobby's place, Sam prays for Castiel to reconsider and give up the souls. A few minutes later Castiel appears, disheveled, bloody, and looking ill. He says he needs their help.

He listens to Sam's call and agrees to put all the souls back in Purgatory. Before the opening of the door, he expresses regret at what he has done and wishes that he could have restored Sam back to normal, and promised to do so if he survived. After he lets out all the souls, Cas passes out but wakes up. He automatically begins to contort and struggle as the Leviathan had held on to his body are trying to take over.

Castiel is soon overpowered by the Leviathan who in turn take control of him, presumably taking him far away. They begin by throwing Dean and Bobby against a wall before saying that they're going to have fun now.

Soon after flinging them, his vessel begins to ooze black blood, and Dean smugly points out that the vessel can't contain the power of the Leviathans. They leave saying they will be back for Dean.

The Leviathans are able to guide Castiel's vessel to a water reserve and the vessel explodes in a whirlpool leaving the Leviathans to escape into the water. Later, his trenchcoat is found, Dean folds it up and takes it with him.

It was later revealed in Slash Fiction that the Leviathans learned of Sam and Dean's aliases from Castiel's mind before they sent him away.



Castiel returns in The Born-Again Identity, having been resurrected by God yet again, but has forgotten his previous life as an angel. He now lives as Emanuel, a healer with his wife. Dean finds him again after word of his healings get out. Dean saves his wife and asks him to heal Sam. After regaining his memories as he is smitting multiple demons, Castiel attempts to rebuild the wall in Sam's mind only to discover that it was destroyed. In one last effort to redeem himself Castiel shifted the hallucinations of Lucifer from Sam's mind to his own in order to save Sam. Castiel then looked on in horror as he could only see Lucifer's face as he is committed to the Mental Institute. Meg becomes a nurse at the hospital to look after him.

In Reading Is Fundamental, Castiel awakens from a coma when The Word of God is released from the clay containing it, but is still insane with an eccentric personality. Castiel explains what the Word, but is unable to give Dean the answers he looks for and Dean is still angry with him for what he did to Sam. While talking to Dean, Castiel senses other angels and finds Hester and Inias, two angels from his former garrison. While Inias is happy to see him, Hester is furious due to the damage he caused. Before things can degenerate too far, Dean banishes all three angels. Castiel later meets up with the group on the road to Rufus' Cabin and helps angel-proof it. When Meg returns, he confirms her story that she killed other demons, but warns that she has drawn the attention of the angels. Hester and Inias arrive with two other angels, but in his mental state, Castiel is now a pacifist and refuses to fight, even to save his own life. Castiel is nearly killed by Hester, but Meg kills her and saves him. Afterwards, Inias offers Castiel the chance to return to Heaven, but he chooses not to as he no longer feels like he belongs there. Sam and Dean discover from the translation of The Word of God that they need the blood of a Fallen Angel for the weapon that can kill Leviathans and Castiel happily gives them his blood telling them "always happy to bleed for the Winchesters." Castiel then disappears, not sure where he's going next, something he finds amazing.



In Survival of the Fittest, Castiel has Meg bring him to the Winchesters after learning that the Leviathans have killed all of his garrison. Crowley arrives and is furious to see Castiel alive, but leaves him alone as he is insane and he doesn't want to pick a fight with a crazy person. He also leaves Meg alone when Castiel gets defensive of her, telling Sam and Dean that Castiel is vital to defeating the Leviathans. Castiel denies any knowledge of what he's talking about however. After finding out that the Leviathan leader Dick Roman has made multiple copies of himself, Dean turns to Castiel for the help Crowley said he could give them, but he refuses to do anything due to his new pacifism and briefly leaves during which time Meg reveals that due to being the Leviathans original vessel, he possesses the ability to tell them apart and could identify the real Dick Roman. After watching Bobby be put to rest, Castiel takes Dean to retrieve the Impala and explains his reasoning for refusing: he feels that he is bad luck and will cause more harm than good if he gets involved again. He also sees his resurrection as an unending punishment for his actions. Dean finally forgives him for what he did to Sam and Castiel agrees to help, possibly out of loyalty to Dean as Dean believes he will die in the attack. The next day, while Sam rescues Kevin Tran, Castiel and Dean make their way through SucroCorp looking for the real Dick. They dispatch another Leviathan and confront Dick who taunts Castiel about his role in the Leviathan mess. Castiel tries to take Dick on, but is thrown into a wall and easily defeated. This allows Dean to stab Dick with the weapon, but it doesn't work. This causes him to lower his guard and Castiel restrains Dick from behind while Dean stabs him through the neck with the real weapon, killing him. However, Dick pulsates a strange aura and after he explodes, there is no sign of Dean and Castiel. When Dean wakes up, Castiel, with his original personality apparently back, tells him that they are in Purgatory and are more likely to die then get out. He then disappears leaving Dean alone and surrounded by monsters.

Season 8
In We Need To Talk About Kevin, Dean escapes Purgatory with the help of the vampire Benny, but Castiel is not with him. Dean later tells Sam that Castiel died in Purgatory, that it got hairy near the end and Castiel "let go." While Dean doesn't elaborate, this clearly affects him greatly.



Dean has flashbacks of Castiel and it was revealed in What's Up, Tiger Mommy? that he had succeded in his relentless search of finding Castiel. After they greet, Dean asks if he is sane again, which Cas says he is, or in their case, as sane as he can be, seeing as he an angel in Purgatory. He then tells Dean that after their arrival in Purgatory, he actually ran away. This lead Dean to believe he left him to fend for himself. Shocked and disbelieving this notion, Castiel elaborated by telling him that he was surrounded by Leviathan and had to get them away from Dean to protect him. Dean firmly insisted that he would not leave Purgatory without him.

He appears in another flashback, where he is struggling to hold on to an arm, while it is unclear what the scenario is, Castiel shouts Dean's name as they are pulled apart.

In flashbacks in Blood Brother, Castiel, Dean and Benny come under attack by three monsters and Castiel kills one with his powers. Castiel and Benny try to convince Dean to let Castiel stay away from Dean because as a Seraph he is drawing monsters to him and the way out of Purgatory might not even work for him as he isn't a human or former human like Benny. However, Dean refuses to leave him behind and before they can argue anymore, Castiel senses Leviathans approaching them. Castiel is unable to teleport them out as the Leviathans are too close so they run, but are ambushed by two Leviathans. One manages to defeat Castiel, but before she can kill him, Benny decapitates her, saving Castiel to Dean's shock.

Castiel finally escapes Purgatory in A Little Slice of Kevin. He claims he could not remember how he escaped, a story not received well by a doubtful Dean. Castiel aids the Winchesters and Mrs. Tran in saving Kevin and retrieving the tablet from Crowley. He displays much of his previous abilities, but suffers observable fatigue after using them. Sensing Kevin in danger, Castiel teleports into the room with him and Crowley and confronts his former partner with his Angel Blade. Crowley pulls out one of his own and believes Castiel is bluffing in his clearly weakened state. Castiel displays his wings and goes to smite Crowley who finally retreats, but tries to take the tablet with him. Castiel smashes it in half and Crowley only gets away with one half. The experience causes Castiel to collapse however. After the confrontation with Crowley, Castiel reveals to Dean at the portal that he intentionally wanted to be left behind in Purgatory as a form of penance. Moments after, Castiel finds himself with in Heaven, with another angel. It is then revealed that his escape was orchestrated by the angel Naomi, who sent an incursion that claimed the lives of several angels to aid the seraph. Much to his own surprise, Castiel casually reveals information about the Winchesters and the tablet under the simple request of Naomi. He is then sent back to earth without recollection of the meeting with Naomi and the orders to report into her every so often. He then agrees to help Sam and Dean search for the second half of the tablet and fixes Kevin's cut-off finger.

Castiel formally took up the mantle of being a hunter in Hunteri Heroici. Dean and Sam were skeptical at first, but both eventually allowed the seraph to join them in a case that Castiel himself found. The Winchesters also guided Castiel on how to pose and act as an effective hunter. Castiel also admits that he fears returning to Heaven: he fears that when he returns and learns just how bad he made it, he will kill himself out of regret. While Castiel is awkward and clumsy at being a hunter, he proves very helpful in solving the case, using his powers to bring Sam into the mind of Fred Jones, a man who is living inside his own mind as it is easier than having to live with the real world. Sam gives Fred a speech about living in a dream world and how it can be good for awhile, but eventually you have to wake up and deal with your problems, something Castiel clearly listens to. After the situation is resolved, Castiel offers to remove Fred's powers when he wants to make sure it won't happen again, but warns that it will be very painful and he isn't sure how much of him will be left. Fred agrees and Castiel does the procedure, leaving Fred in a mentally-distant state, but happy. Even though Sam and Dean have come to accept Castiel as a hunter, to the point that Dean offers to allow Castiel to ride "shotgun" in the Impala, something he had previously refused, Castiel decides to return to Heaven to face up to what he has done, but Naomi refuses to allow it and asks him what he wants to do. Castiel decides to watch out for Fred for a few days, but also to stop running from his problems.

In Torn and Frayed, he is shown helping people in need, in repentance for his previous actions. He cures a baby of an inguinal hernia (due to which the baby cries incessantly), which couldn't be detected by doctors themselves. He was ordered by Naomi to rescue a fellow angel Samandriel, who was held captive by Crowley in an abandoned building heavily covered with Enochian sigils that he locates with Dean's help. Castiel gathers the ingredients needed to make a "demon bomb" and retrieves Sam against Dean's wishes, telling them to "stow their crap." During the attack, Castiel gives Sam his Angel Blade to kill demons with and remains outside until Sam and Dean deal with the wards and demons. He was then able to teleport Samandriel to safety, but not before Samandriel revealed to Crowley the existence of an Angel tablet. Outside, Samandriel warns Castiel about this and that "they're" controlling him. Castiel asks who is and who Naomi is when Samandriel brings her up, but before he can explain, Naomi orders Castiel to kill Samandriel, which he does without hesitation. (Throughout the rescue, Castiel saw vague flashbacks of Naomi inserting a certain device into his eye.) Shocked, he demands answers from Naomi, who reveals that knowledge of the angel tablet could cause great harm in the hands of a demon. Under Naomi's orders, Castiel claims he killed Samandriel in self-defense and that he is taking his body to Heaven to be put to rest (in actuality so Naomi can determine how much he broke), but his weird behavior and the fact that one of his eyes starts bleeding draws their suspicion that something is wrong and that he is being controlled.

In Remember the Titans, Dean desperately prays to Castiel to look after Sam who is not doing so well with his trials. Despite Dean's near-begging, Castiel does not appear or respond.

In Goodbye Stranger, Castiel has become so indoctrinated to Naomi's control that he has no trouble ruthlessly killing a copy of Dean and is shown to have killed hundreds of others. He is sent to locate the angel tablet which is in one of Lucifer's Crypts and to stop Crowley from getting it. His interogation and killing of the demons involved draws Sam and Dean's attention and he arrives in time to save a weakened Sam from a demon that is attacking him. Castiel captures another demon and binds it in a Devil's Trap before claiming to Sam and Dean that he is searching for Crowley's half of the demon tablet and that the demons are searching for a parchment that will allow them to translate the tablet without a Prophet. Castiel tortures the demon for information and after learning the location of the being that is telling the demons where to find the crypts, he kills her before she can reveal the truth to Sam and Dean on Naomi's orders. Castiel heads to the hotel the demon indicated without Sam and Dean and kills all of the demons there before they arrive and they find that the hostage is Meg. Castiel is able to get Naomi to let Meg explain the truth as she could be useful and afterwards bandages her wounds. Meg flirts with Castiel about their kiss in Caged Heat and subtly tells him she wants to have sex with him, something he doesn't catch on to at first. The group travel to the warehouse where the crypt is located and when Dean orders Sam to stay outside, Castiel tells Sam that he is damaged on a level that even Castiel can't heal. Castiel later explains to Dean that the damage is all the way down to the subatomic level before they find the crypt. Naomi orders Castiel to throw Dean off the trail or kill him, but he is forced to point out the box with the angel tablet in it to Dean as it is angel-proofed. Under Naomi's control, Castiel attacks Dean and tries to kill him, but manages to break free at least somewhat before he kills him after Dean tells him that they are family. When Castiel picks up the angel tablet, it severs Naomi's connection with him and all of her control over him and he heals Dean and explains what happened. However, Castiel senses that for some reason he must keep the tablet safe from Dean as well and disappears with it. Naomi later tells Crowley that Castiel is doing what he is meant to do, which is protect the tablet from all threats. Castiel is later seen riding in a bus with the tablet to an unknown location.

In response to Castiel's departure with the tablet, Naomi starts a search for him, trying to enlist Dean's help in Taxi Driver at which time she claims that he is still insane and was simply misinterpreting her orders when he tried to kill Dean. Despite Castiel's behavior, Dean trusts him over Naomi and refuses to believe her.

In The Great Escapist, Castiel travels between all of the Biggerson's at once, stopping only for very brief periods to throw the angels off of his trail. Its successful until they slaughter everyone in one of the Biggerson's to force him to stop and learn what happened. While he is distracted, Castiel is captured by Naomi, Ion and Esper. Naomi reveals that Castiel has been involved in many atrocities throughout human history, but that his memory of it has been erased because he never follows orders like he is supposed to. Naomi demands the angel tablet, but Crowley arrives, kills Esper, wounds Ion who is revealed to be working with him and drives Naomi off. Crowley has realized that Castiel is keeping the tablet close to him in case Naomi ever tries to regain control of him again and shoots Castiel in the gut then painfully pulls the angel tablet out of his body. Before he can do more, he gets a call that Kevin has figured out Crowley's trick and Crowley leaves to deal with the problem, leaving Ion to guard Castiel. Castiel pulls the bullet Crowley shot him with out, overpowers Ion and pushes the bullet through his eye, killing him. Castiel later appears on the road in front of Sam and Dean, severely wounded and weakened and asking for their help.

In Clip Show, Castiel is living in the Men of Letters Bunker with Sam and Dean and slowly recovering from his wound. Dean is furious with Castiel and refuses to forgive him for abandoning them again and most importantly, not trusting Dean despite all of Castiel's attempts to apologize. Castiel watches the film they find of a mysterious exorcism and comments that the changed words mean to cleanse or purify. When Sam and Dean leave to check it out, Castiel goes to get them food as they are out, but makes a mess of the store. He gets Dean's favorite beer and porn to try to appease him and also tries to get him pie and is angry and desperate when they are out. Metatron arrives and calms him down and reveals that Heaven has degenerated into many warring factions which Naomi is only the leader of one, not all of Heaven as he had previously believed. Metatron suggests Castiel do the trials to seal up Heaven so that they can lock the angels together and force them to sort out their problems while keeping the war from spilling over onto Earth. Castiel agrees after Metatron reveals that as the Scribe of God, he knows the trials even without the angel tablet and is stunned when the first trial is to kill their waitress and cut out her heart as she is a Nephilim, the child of an angel and a human. When they go after her, Castiel hesitates as she is an innocent woman, but when she attacks him and Metatron, he kills her with his Angel Blade.

In Sacrifice, Metatron reveals that they must get Cupid's bow as the next trial and Castiel asks him about God. Metatron describes him as like one would expect: larger than life, gruff, a bit sexist and eminently fair. As they wait for Cupid to come to make the man, Dwight, fall in love, Castiel goes through personal ads to try to make it go faster by finding him a candidate. While they are waiting, Naomi arrives with two other angels and captures Metatron. Castiel faces off against them with his Angel Blade, but lets them go when Metatron tells him to. Needing help, Castiel goes to Dean who agrees after Sam insists. Castiel and Dean bring the angel tablet to Kevin to translate the last trial and Castiel scares him into doing it when he refuses. As they watch, a woman named Gail approaches Dwight and makes him and one of his regulars fall in love. Castiel prepares to confront Gail while armed, but Dean convinces him to talk first. Gail is worried about the state of Heaven and agrees to give them her bow if they really think they can calm it down, but Castiel must cut it out of her hand. Kevin contacts them to let them know that while he has found the trials, he doesn't see anything about killing a Nephilim or the bow of a Cupid. At that moment, Naomi arrives and though Castiel goes to fight her, she insists she just wants to talk and Dean gets him to hear her out. Naomi tells Castiel that she has learned from Metatron's mind that what he is doing isn't going to seal Heaven up, it will instead expel all angels from it permanently. She expresses remorse for her actions, telling Castiel and Dean that angels were meant to protect humanity and lost sight of that somewhere along the way. She also informs Dean that if Sam completes the trials he will die as he makes the "ultimate sacrifice" to seal Hell. Naomi offers to hear Castiel out if he really wants to return to Heaven before disappearing. When Kevin can't confirm what Naomi told them through the angel tablet, Castiel doesn't believe her, but transports Dean to the church where Sam is curing Crowley before departing for Heaven. There he finds Naomi dead with her own torture device impaled in her brain and is captured by Metatron who reveals that she was telling the truth. Metatron takes Castiel's Grace as the last ingredient for the spell he is working and sends him to Earth, but not before telling him that he is now human and Metatron wants him to live a human life, die, come to Heaven, find him and tell him about that life. On Earth, Castiel watches as all the angels begin to fall to Earth as Metatron's spell takes effect.

Season 9
In I Think I'm Gonna Like It Here, Castiel has landed in Colorado and nearly gets run over by a truck. Castiel is left stunned by the cuts on his palms from dodging the truck as he has never experience the types of injuries mortals get before and gets a ride from the driver to a gas station. Reluctantly taking money the driver gives him, Castiel goes to call Dean but meets a Fallen Angel named Hael who is looking for guidance. Castiel suggests Hael take advantage of the new life given to her and go see the Grand Canyon that she claims to have created. Deciding to go with her, Castiel first calls Dean and confirms that Ezekiel is a good guy and can help and then is convinced to come help Dean instead of Hael. She knocks Castiel out and kidnaps him, revealing that she plans to possess him as he is strong and her vessel is weak and deteriorating. In order to stop her, Castiel puts on his seatbelt and then crashes the car, incapacitating Hael while surviving with minor injuries. Castiel takes her Angel Blade and declares his intent to guide all angels in their new lives on Earth, but when Hael threatens to broadcast his location to every angel looking for him if he doesn't say "Yes," Castiel kills her. Later, Castiel starts to dry-clean his bloody clothes at a laundry mat, but needing food and water, steals new clothes and buys candy and a water bottle instead.

In I'm No Angel, Castiel travels towards the bunker, living in homeless camps and trying to avoid angels. After being confronted by and killing an angel one night, Castiel has himself warded against angels being able to locate him with a tattoo. In response, the angel Bartholomew sends rouge Reapers after Castiel. While looking for food in a dumpster, Castiel meets April Kelly, not knowing that she is possessed by a Reaper and goes home with her. April cleans the wound he got from the angel he encountered and they have sex, but while searching for his Angel Blade the next morning, she reveals herself as a Reaper, ties him up and tortures him. Castiel tells her how he didn't know about Metatron's spell and that he doesn't know how to reverse it, but that his Grace was the final ingredient and thus he may be the key to the reversal. When Sam and Dean show up, the Reaper kills him with the Blade. After Dean kills the Reaper, Ezekiel takes control of Sam and resurrects Castiel and Dean claims that he made a deal with the Reaper not to kill her if she resurrected him then killed her anyway. Castiel moves to the Bunker with Sam and Dean and is excited by the Bunker's abundance of food and other human necessities and tells a shocked Sam and Dean how he had sex. Castiel sits down to eat, but after learning from Ezekiel that Castiel must leave because the angels are after him, Dean reluctantly tells him so as Ezekiel will be forced to leave Sam and flee otherwise and Sam will die.

In Holy Terror, Castiel after being tortured by Malachi, uses the misguided angel's plea to join Metatron's army (believing that Castiel was affiliated with Metatron) as a chance to escape. Castiel slits the angel's throat, taking his Grace as to become Angel rather than human. Castiel then continues to kill the former angel and slaughters his way out of Malachi's hideout.

Castiel then went on to call Dean, alerting him that Ezekiel had died in the fall and that the angel that had promised Sam's recovery is an imposter.

In Road Trip Castiel, wearing a new suit and trenchcoat, arrives at the bunker to find the main room trashed and a distraught Dean. Dean explains what happened and how he intends to hunt down and kill the angel possessing Sam for revenge even though it will kill Sam. Castiel however, comes up with the idea of having Crowley do the same thing he did to Samandriel to try to bring out Sam's mind so he can expel the angel. Enlisting Crowley's help, the three take a car that Castiel stole as he can no longer teleport and find the angel. The angel overpowers Dean, but while he's distracted, Castiel knocks him out. After confirming that the angel healed Sam enough that he can finish the job, Castiel watches with Dean as Crowley tortures the angel and follows Dean out when he can't watch anymore. Sympathetic with Dean and forgiving him for kicking him out, Castiel comforts him until Crowley calls them back as he has managed to activate the angel's "factory settings." Castiel is furious when the angel identifies himself as Gadreel, blaming him for everything that has gone wrong in the world. However, Gadreel regains control, telling them that he can withstand the torture for a very long time and they can't stop him without killing Sam. Desperate, Dean asks Castiel to possess Sam to make him aware of the situation, but Castiel is unable to as he would need Sam's permission to do so. When Crowley offers instead in exchange for his freedom, Castiel is reluctant, but removes Sam's anti-possession tattoo so Crowley can possess him. The plan works and Sam expels Gadreel. After Crowley returns to his body, Castiel notes the appearance of Abaddon and the three leave Crowley to deal with her. A safe distance away, Castiel heals Sam's injuries from the torture and some more of the damage the Trials did to him telling him that while he will have to do it in stages and over time, he will be able to finish Sam's healing. Castiel stands a respectful distance away as Sam and Dean speak about Dean's actions and remains with Sam as Dean leaves, alone.

In First Born, Castiel is staying with Sam in the bunker and has nearly healed him fully. He is also upset about the fact that he has lost the ability to enjoy human food. However, he discovers that some of Gadreel's grace is still inside Sam and is slowly disappearing every time Castiel heals him. Reading a book and file from the Men of Letters left, Castiel learns that the Men believed that if the grace was extracted, it could be used to track the angel it belonged to. Sam and Castiel begin a procedure to remove the grace, but though it proves dangerous as Sam's body starts to revert to its state before Gadreel possessed him, Sam insists that they continue. With Sam's condition deteriorating as they need more grace then can be safely taken, Castiel chooses to finish healing him rather than take the rest of the grace, destroying the last of the grace inside Sam. Castiel explains that his brief humanity caused him to understand that its not worth it to sacrifice others for the sake of what you need and that he understands where Sam is coming from wanting redemption for his acts as he also wants that, but its not worth his life. Sam and Castiel later use the grace they extracted to try the spell, but it proves not to be enough. Telling Sam that he believes that Metatron is the key to setting things right, Castiel sets out to locate him.

Alternate Future - 2014
In an alternate post-Apocalyptic future in which Lucifer has ravaged the world with the Croatoan Virus, the Angels abandon Earth and Castiel loses his remaining powers (though he is still able to sense that the Present Dean is from the past). He joins the Future Dean's resistance movement against Lucifer, but quickly becomes bitter and depressed with the situation. As a result, he spends most of his time immersed in drugs and women.

Future Castiel participates in the failed attack on Lucifer at the end of the episode. He is presumably killed along with the rest of the Future Dean's group.

Powers & Abilities
As one of main supporting characters, Castiel's abilities have changed over the course of the series. He first appears as an ordinary angel in Seasons 4 and 5. During his rebellious times in Season 5 his power decreased slowly until almost becoming mortal in the final episode. After his second death occuring in the last episode of Season 5, he was resurrected and imbued with new power by God, becoming a Seraph. Later in the Season 6 finale, he absorbed milllions of souls in Purgatory, becoming one of the most powerful creatures in the series. This also altered his true form in some way as the flapping of wings can't be heard when he teleports. After releasing all the souls and his third death, he returned as a Seraph again. However, in "Sacrifice," Metatron removes his grace and thus rendered Castiel mortal and powerless. Despite this, he can still hear "angel radio" and capable enough to trick and kill some fallen angels. He has also displayed the ability to recognize an angel despite having only met him once and never in a vessel. Castiel has since stolen the grace on an angel which has turned him back into an angel and restored all his powers except teleportation as he no longer has his wings.

Original Abilities
Since his first appearance, Castiel possessed astounding abilities and was one of the most powerful supernatural beings the Winchester brothers have ever met at the time. Uriel seemed so sure of his powers that he felt confident that if Castiel joined him and his fellow rebels, they would be powerful enough to challenge Heaven and free Lucifer from his Cage. Even Anna, despite having once been Castiel's superior, chose not to directly confront him after Castiel appointed himself as the Winchesters' guardian, and instead went back through time in an attempt to ensure that Sam and Dean are never born. Even when not at full strength, he was shown to be a very capable fighter due to him killing several, at least over half a dozen of his angelic siblings when he was fighting to prevent the Apocalypse.

These were Castiel's powers as a common angel. Much of this power depended on his link to Heaven.
 * Angelic Possession - As a spiritual being, Castiel needs to use a vessel while on Earth. As an angel, he requires the vessel's permission.
 * 'Astral Projection' - Castiel is able to partially project his true form while inside his vessel, which appears as shadows of feathery wings on his back.
 * 'Chronokinesis' - Castiel can travel forward and backward in time, and he can take passengers.
 * Dream Walking - Castiel appeared in Dean's dream to deliver him a message.
 * Eidetic Memory - Castiel has the face and name of every prophet etched into his memory.
 * Healing - Castiel could instantly heal the wounds, diseases, and toxins of humans. Lost when he became a Fallen Angel the first time as the power came from Heaven but regained after second resurrection.
 * Immortality - Castiel as an angel doesn't age and is immune to disease. He never tires, and does not need to eat, sleep, drink, or breathe to sustain himself.
 * 'Invulnerability' - As an angel, there are very few things able to kill Castiel. He possesses accelerated healing abilities that allow him to heal wounds that would kill a human in seconds, if not instantly. He is unharmed by extreme temperatures.
 * Smiting - Castiel is able to kill lower-level demons and other beings like monsters with a simple touch. When this happens, a strong light appears from the eyes and mouth of the victim and burns them severely from the inside out. Lost when he became a fallen angel as it came from Heaven but regained a more powerful version after second resurrection.
 * 'Resurrection' - Castiel brought Dean, Sam and Bobby back from the dead. Lost when he became a Fallen Angel as it came from Heaven but regained after second resurrection.
 * 'Sedation' - Castiel can cause instant unconsciousness in humans by tapping their forehead.
 * 'Pyrokinesis' - Castie l displays the ability to burn through ropes holding him and uses the same power to burn "Crowley's" bones.
 * Super Strength - As an angel, Castiel is physically much stronger than humans, spirits, monsters, most, if not, all lesser angels and most demons. He proved capable of overpowering common angels and humans with eas, as he once beat Dean to nearly a bloody pulp. Although incredibly strong in his own right, an angel such as Uriel or a high-level demon such as Alastair had superior levels of super strength. He was no threat to archangels.
 * Expert Swordsman - While not as physically strong as most of his angelic bretheren, Castiel is highly skilled in swordplay with angelic blades, having defeated several angels at least as powerful as him on many occasions, despite being outnumbered. Even when he began losing his powers after becoming a fallen angel, this remanined unchanged.
 * Supernatural Perception/Senses - Castiel can see things hidden to humans. He is capable of immediately discovering a person's identity or their prior medical status by simply smelling their remains, regardless of the condition of said remains. He is also capable of speaking to and understanding animals and even listen onto radio frequencies.
 * 'Telekinesis' - Castiel can impart kinetic energy on matter with his mind. He used this to twist Ruby's Knife into Alastair's wound after having stabbed him it. He later uses this power to unscrew a bolt from a distance.
 * 'Telepathy' - Castiel is able to read the minds of humans and lower-level angels.
 * 'Teleportation' - Castiel can travel from one place to another instantly. Like with all angels, this is accompanied with the sound of wings flapping.
 * Voice Mimicry - Castiel once perfectly imitated Bobby Singer's voice.
 * Protective Charm - Castiel is able to protect someone from harm beforehand, as seen when he prevented his vessel, Jimmy Novak from burning his hand on a pot of boiling water when asked for a sign of faith.
 * Apporting - Castiel is able to teleport Dean to St. Mary's Convent from Chuck's house with a touch of his hand to his forehead and later teleports him away from Zachariah to his side at a roadside.
 * Spell Casting - As an angel, Castiel has extensive knowledge of Enochian symbols and spells which he has used for a variety of effects. He could draw an Enochian Devil's Trap that could completely suppress and bound a demon as powerful as Alastair. He also knew of symbols that could banish or ward off angels. After his first resurrection, he branded Sam and Dean with a pattern of symbols that would conceal them from every angel in creation, even one as powerful as Lucifer. He later did the same to Adam.
 * Skilled Fighter - Castiel has also shown himself to be a skilled unarmed fighter, capable of temporarily holding off the white eyed demon Alastair, as well as fighting and holding his own against Uriel. This skill remained with him as he became a fallen angel, as he brutally attacked Dean at one point and even fought Leviathans and held two off at once, with only his fists, while later a Seraph.

Seraph Abilities
After he was killed by Lucifer during the Apocalypse, God resurrected Castiel and endowed him with new and stronger powers, as he said, "I do believe he brought me back. New and improved." Castiel reveals in "Blood Brother" that he's now a Seraph, a higher caste of angel. Not only has he gained greatly enhanced powers while retaining all previous ones, but now he is independent from Heaven. This means he retains his full powers and angelic grace despite being a Fallen Angel and cut off from Heaven.

Initally following his rescue from Purgatory, Castiel appeared weakened from his time in the monster realm as he is quickly drained from using his powers such as teleporting or killing a low-level demon. However, this seemed to be temporary as he recovered later.

His Seraph abilities include:
 * Advanced Chronokinesis - Castiel now can send people back through time and bring them back without having to physically be there with them. However, the further back he sends someone, the harder it is to retrieve them. This was evidenced by the time he sent Sam and Dean to the 1800's, he could only send them for 24 hours or else he would be unable to bring them back.
 * Invisibility - Castiel can become invisible to humans.
 * Mental Manipulation - By placing his hand on a person's forehead, Castiel is able to manipulate a person's mind, being able to create, erase or alter memories or simply alter their perception of events altogether. He easily tore down the mental dam inserted by Death on Sam that protected him from the memories of him being tortured in Lucifer's Cage. Though he was unable to cure Sam from the resulting madness it caused, he was able to transfer the mental damage from Sam to himself. He is also able to show a person the true version of their memories, not just the version they choose to remember as seen when he made Dean see what really happened when he escaped Purgatory. He has also been shown to be able to enter other people's minds and take someone with him as he entered Fred Jones' mind with Sam. However, this requires him to maintain physical contact with both parties. Also he could perform a process to remove Fred's powers, due to them being mentally based, presumably by causing damage to specific parts of his mind, as he ended in a completely catatonic, unresponsive state at the end of the process.
 * Advanced Pyrokinesis - Castiel can now no longer just create fire, but he can manipulate and extinguish it effectively.
 * Reality Warping - Cas, in one instance, altered reality, by shaking a 'Sorry' board-game, and having everything instantly set up. He was later able to fill a vial with his blood just holding it tight in his hand and not making any cuts. His highest capability in this area was when he was able to change his appearance and clothes into his original one after returning from Purgatory.
 * Enhanced Superhuman Strength - Being a Seraph, Castiel has exhibited higher levels of physical strength than he did as a common angel. He was capable of overpowering humans, spirits, monsters, demons and even his angelic brethren with greater ease as seen against Raphael's soldiers or against his former friend Rachel. However, against the Archangels, such as seen with Raphael, Castiel was inferior against them. Though he could still be outmatched and killed by the Leviathans, Castiel proved capable of standing up against them. In Purgatory managed to briefly hold off two Leviathans, and ultimately incapacitate them with Dean's help. Castiel also proved to be strong enough to lift a 1 ton anvil with ease.
 * Advanced Smiting - Castiel's angelic killing touch became much more powerful after his resurrection. He could instantly kill several demons with great ease by using this ability. He was also capable of killing various monsters using this ability such as Lenore, or other creatures even in Purgatory. He may even be capable of killing or at least harming a Leviathan, as seen in Purgatory when he tried to do this to one, and it quickly tried to evade the seraph's touch but this is unlikely. However, more powerful beings such as the archangel Raphael, however, were immune to this power and could also extend this protection to lesser beings such as demons. It is revealed that this power burns out the eyes of the being it is used on and liquifies all of their organs.
 * Advanced Healing - Castiel has displayed the ability to not only heal any wound, but can also cure people of infections that will turn them into monsters as shown when he cured Dean of his transformation into a Jefferson Starship. Castiel also believed he could heal Kevin Tran of a cut-off finger which is later shown to be true. On one occasion while healing a gunshot wound his hand glowed though he usually heals without any visible sign besides the injury healing. However, there are some things even he can't heal. According to Castiel, Sam is damaged on the subatomic level from his trials and it is beyond his power to fix that. However, after Gadreel heals most of the damage done to Sam, Castiel states he will be able to finish the job over time in stages.
 * Vessel Locking - Castiel has displayed the ability to grab a demon's smoke form and force it back into its body to smite it.
 * Proficient Torturer - Castiel was shown to be skilled at the art of torture, as seen when he tortured one of Eve's Jefferson Starships into giving him information in a matter of minutes, despite having his powers blocked by the mother of all and on another occasion, when he tortured Dr. Visyak (who had previously resisted Crowley's atempts at the same) into giving him the spell to open Purgatory.
 * 'Soul Reading/Channeling' - By pushing his hand into a person's chest, Castiel can determine the presence and condition of a person's soul, and if the soul was branded by a deal. He can also siphon energy from or completely absorb a soul to recharge and enhance his powers. The process is extremely painful and delicate, having been noted by Castiel as putting one's hand into a nuclear reactor and causing the person to explode should anything go wrong.
 * Leviathan Perception/Sensing - Due to having been used as a vessel for the Leviathans, Castiel can see past their vessels and shapeshifting abilities and correctly identify them. This ability allowed him to identify the real Dick Roman, so he and Dean could kill him. While in Purgatory, Castiel was able to sense the presence of two nearby Leviathans before they could attack the group while Dean and Benny were completely unaware of them and later sensed two more approaching as he and Dean neared the escape portal.
 * Enhanced Astral Projection - As a Seraph, Castiel's true visage is now far more hazardous and far more terrifying to creatures such as humans, demons, and other earthly monsters. While projecting his true form from his vessel, his irises gained a deep and bright blue glow, his body emitted a powerful pinkish-white light and the shadows of his wings appeared on his back. Even in a weakend state, he was able to intimidate Crowley into retreat, despite the demon's position as the current King of Hell.

Soul-Enhanced Abilities
In order to fight the war against Raphael, Castiel made a deal with Crowley for a loan of 50,000 souls, which boosted his powers and allowed him to launch the first strike against the Archangel, though he was still grossly outclassed by more powerful creatures such as his older brother Raphael and Eve. After absorbing the millions of souls from Purgatory (including a large number of Leviathans), Castiel was endowed with god-like powers that made him both highly dangerous and unstable, due to the power intoxicating him and clouding his judgement. During this time, his power exceeded that of the Archangel Raphael and he was confident enough to challenge Death, although Death simply dismissed him as a mutated angel and found him as insignificant as everyone else, implying he couldn't actually challenge him and it was just arrogance.

His new powers take much toll on his form. His vessel started to melt as a result of him being unable to contain that much power. Death also referred to him as a mutated angel, which was noted by the lack of the common sound of wings when he teleported from place to place, implying that his true form, or spirit, was significantly altered.

His soul-imbued powers included:


 * Holy White Light - Castiel is able to emit a powerful white light from the palm of his hand in a similar fashion to that of an Archangel. He used this power to termporarily banish Raphael and killed at least a dozen Jefferson Starships at the diner where he, Sam and Dean were being held by Eve. This ability apparently relied on his target having their eyes open as he yelled at Sam, Dean and Bobby to shut their eyes when he used it and they were unaffected as a result.
 * 'Power Negation' - He was capable of neutralizing the power of other creatures, including an Archangel's powers.
 * Molecular Combustion - By snapping his fingers, Castiel can speed up molecules to the point where it can cause an individual to explode. In an ironic twist, he killed the Archangel Raphael in this way, after having previously suffered the same death at the hands of his older brother.
 * Nigh-Omnipotence - After consuming the Purgatory souls, Castiel became one of the most powerful beings in the universe. He effortlessly obliterated the Archangel Raphael with a snap of his fingers and later killed thousands of angels who were Raphael's followers in Heaven. He could kill humans with a single thought or word; such as when he said to a hypocritical preacher  "He who lies in my name shall choke on his own false tongue." causing the preacher to literally choke on his own tongue. As well as perform miracles like making the blind see or curing an entire colony of lepers. Castiel even told Crowley of his intial intention to eliminate Hell, an entire spiritual realm. However Death was unconcerned by Castiel's newfound powers and openly mocked him calling him no God and a 'mutated angel'. Notably, Castiel was concerned with keeping Michael and Lucifer in the Cage which suggests that they may be more powerful than him even while in his super-powered state.
 * Advanced Invulnerability - Due to his massive absorption of the Purgatory souls, Castiel became immune to nearly any form of harm as seen when he was unfazed from being stabbed in the back by an angel blade. Enochian signs were now useless against him as seen when he tracked down and cornered Crowley in his sigil-covered trailer. However, Death and God could still kill him. He was also vulnerable to the mass of souls (and Leviathans) inside him, which, according to multiple individuals, would eventually cause Castiel's human vessel to explode due to his inability to properly contain so many souls and control all that power.
 * Spell Negation - With a simple snap of his fingers, Castiel was able to break the powerful spell that Sam, Dean and Bobby had cast to bind Death, something even the latter was unable to do, although the fact that he was bound was probably atleast partially responsible for this.

Death tally
Castiel has died four times over the course of the show, only to be resurrected by God the first three times and Gadreel once. By "Survival of the Fittest", he believes his resurrections to be punishments rather than gifts or even rewards, as things only get worse when he is brought back.
 * Imploded by Raphael (off-screen) in "Lucifer Rising".
 * Imploded by Lucifer in "Swan Song".
 * Died from the effects of containing multiple Leviathan in "Meet The New Boss".
 * Stabbed with an Angel Blade by April Kelly in "I'm No Angel"

Relationships

 * Castiel and Dean - Castiel and Dean are like brothers to each other.
 * Castiel and Sam - Castiel and Sam are friends.
 * Castiel and Bobby - Castiel and Bobby are friends.
 * Castiel and Meg - Although Castiel and Meg are opposite sides, they both have a weird connection to one another.
 * Minor Relationships - Castiel's other relationships he encounters.

Quotes
"My 'people skills' are 'rusty'. Pardon me, but I have spent the last 'year' as a multi-dimensional wavelength of celestial intent."

- Castiel, explaining to Sam and Dean his time away.

Sam: "Are you... drunk?"

''Castiel: "No!" (Stumbles slightly) "Yes"''

Sam: "What the Hell happened to you?"

Castiel: "Ugh, I found a liquor store."

Sam: "And?"

Castiel: "And I drank it!"

​-Castiel, hammered, talking to Sam

-Castiel is watching TV while Dean and Sam are working on a case.

Castiel: How complex

Dean: Yup

Castiel: If the pizza man truly loves this girl, why does he keep slapping her butt?

-Castiel, watching pornography

-Castiel, after kissing Meg

Castiel: I learned that from the pizza man!

-Castiel and Meg talking

''Meg: After all this is over, we could rearrange the living room and order a bunch of pizza. You get it?''

Castiel: No, I don't get it.

Meg: (Waggles eyebrows)

Castiel: Oh, now i get it!

​Notes

 * Castiel is based on Cassiel, an angel often mentioned as one of the Seven Archangels, the angel of solitude said to preside over the deaths of kings. Though Crowley references Castiel as "the angel of Thursday" in The Man Who Would Be King, Cassiel was associated with Saturday, historically. He was associated with the planet Saturn and the astrological signs Capricorn and Aquarius, and was known to be particularly passive, said to prefer to watch events unfold from a distance.  
 * He is among the most popular characters of the show; in fact, he was spared from the writers' original plans at least twice of being permanently killed off in On The Head Of A Pin and Swan Song for this very reason. His actor, Misha Collins, was promoted to regular status in Seasons 5, 6 and 9, which only two other actors, Katie Cassidy and Lauren Cohan, had previously held. Collins has also been the only other actor than Jared Padalecki and Jensen Ackles (Sam and Dean's actors) to be included in the group seasonal promotional pictures until Season 8 which also includes Crowley.
 * Castiel is the most recurring angel in the series, whose appearances even rival Bobby Singer's.
 * Because he believed his character's tenure on the show would be short, Collins used a deep, gravelly voice while portraying his character that he believed fit Castiel's introduction as a powerful entity. He later came to regret this choice when Castiel became a recurring character, as the voice Collins used for Castiel hurt his throat. In their scenes on-set together, he and Ackles reportedly compete with one another in who can use the deeper voice.
 * He has killed one major antagonist, Raphael and played a major role in killing another, Dick Roman.
 * He is the first angel to be revealed in the series as Gabriel has the distinction of being the first one to appear, albeit in the guise of a Trickster.
 * Castiel has used two vessels, Jimmy Novak and his daughter, Claire Novak.
 * He is the first angel to have been to Purgatory.
 * Castiel, after becoming a "mutated angel" by absorbing all of Purgatory's souls, when he teleports, the wing flapping sound is no longer heard, insinuating that it affected his true form.
 * Upon shifting Sam's condition onto himself, after he awakes, in his insanity he becomes obsessed with bees. In There Will Be Blood, he admits to wanting to watch them. In Survival of the Fittest Dean mentions he once appeared on the Impala covered in bees. In the same episode, Castiel offers Crowley honey.
 * Despite the Leviathans ability to kill angels easily, Castiel is one of the few beings that has been able to hold his own for at least a short time against them, sharing this with Sam and Dean and the Alpha Vampire. This may be because he is a Seraph, a stronger class of angel than the ones that previously faced the Leviathans. Castiel was able to single-handedly hold his own against two Leviathans in Purgatory until Dean was able to decapitate them. However, he is unable to defeat them on his own and has been nearly killed by Leviathans in Purgatory on at least two occasions.
 * Castiel, like all members of Team Free Will, has been to Hell, Purgatory and Heaven. Only Dean has been to Avalon in addition to the three previously mentioned.
 * Before losing his grace, Castiel was the only known Seraph left in Supernatural as Zachariah was killed by Dean Winchester in the Season 5 episode Point of No Return. He is now apparently one again after stealing Theo's grace.
 * As of season 9, and in order to protect himself from being exposed to other angels hunting him, Castiel ultimately abandons his trademark suit and trenchcoat attire for a time. After becoming an angel again, Castiel dons a new trenchcoat and suit though not a new tie.
 * At some point Castiel learned how to steal and drive a car. As he can no longer teleport without his wings, he stole a car in "Road Trip" to reach Dean though he is never actually seen driving on-screen.

Appearances

 * Season 4
 * Lazarus Rising
 * Are You There God? It's Me, Dean Winchester
 * In The Beginning
 * It's the Great Pumpkin, Sam Winchester
 * I Know What You Did Last Summer
 * Heaven and Hell
 * Death Takes a Holiday
 * On the Head of a Pin
 * The Monster at the End of This Book
 * The Rapture
 * When the Levee Breaks
 * Lucifer Rising


 * Season 5
 * Sympathy for the Devil
 * Good God, Y'all
 * Free to Be You and Me
 * The End
 * I Believe the Children Are Our Future
 * Changing Channels
 * Abandon All Hope...
 * The Song Remains the Same
 * My Bloody Valentine
 * Dark Side of the Moon
 * 99 Problems
 * Point of No Return
 * Two Minutes to Midnight
 * Swan Song


 * Season 6
 * The Third Man
 * You Can't Handle The Truth
 * Family Matters
 * Caged Heat
 * Like A Virgin
 * The French Mistake
 * My Heart Will Go On
 * Frontierland
 * Mommy Dearest
 * The Man Who Would Be King
 * Let It Bleed
 * The Man Who Knew Too Much


 * Season 7
 * Meet The New Boss
 * Hello, Cruel World
 * Shut Up, Dr. Phil (seen in Dean's nightmare)
 * The Born-Again Identity
 * Reading Is Fundamental
 * Survival of the Fittest


 * Season 8
 * What's Up, Tiger Mommy? (seen in Dean's flashbacks of Purgatory)
 * Blood Brother (seen in Dean's flashbacks of Purgatory)
 * A Little Slice of Kevin
 * Hunteri Heroici
 * Torn and Frayed
 * Goodbye Stranger
 * The Great Escapist
 * Clip Show
 * Sacrifice

Castiel
 * Season 9
 * I Think I'm Gonna Like It Here
 * I'm No Angel
 * Heaven Can't Wait
 * Holy Terror
 * Road Trip 
 * First Born