This is all of Castiel's minor relationships from throughout the series.
Castiel and Anna MiltonThey served together in Heaven in the same garrison, with Anna as his captain before she fell. They were probably close, as Castiel states "we have history together".
Castiel and Uriel are later assigned with the task of killing the then-human Anna. Castiel expresses regret and sorrow for having to do this. The mission fails when Anna gets her grace back and escapes them.
The next time Castiel sees her, he tells her he still has orders to destroy her, but she knows that he won't. She questions on whether he thinks what he's doing is right, having Dean torture Alastair. She tries to make him doubt his orders but Castiel becomes angry and states that he is nothing like her, and tells her to leave.
Castiel later calls his sister back and asks her for help on what he should do. She tells him it is time for him to start thinking for himself.
Anna saves Castiel's life during the fight with Uriel by killing the rogue angel. When Anna confronts him about letting Sam out of Bobby Singer's panic room, he betrays her trust and has two angels take her away.
Anna eventually returns to Earth and the two meet again in The Song Remains the Same, she resents Castiel for turning her in shown by taunting him over his search for their father. Castiel suspects that Anna had rejoined the Host, though she says otherwise. By this time, Castiel has also rebelled against Heaven and is regretful of turning her over to them but stands against her wish to kill Sam, going so far as to say he will kill her himself if she tries while declaring Sam as his friend. Anna was surprised at his change and loyalty to the brothers, even seeming proud of him for this. However, she was not swayed and continued her attempts to prevent The Apocalypse by time traveling.
This is the last time they see each other before Anna is killed by Michael.
Castiel and BalthazarThey were old friends from their time together in Heaven. Castiel was shocked when he found out Balthazar had rebelled and was moonlighting as a crossroads demon.
After Balthazar rescues him from Raphael, Castiel sets him free from a ring of holy fire which enables him to escape the Winchesters. Afterwards, Balthazar assists Castiel in the war in any and every task given, including saving the Titanic (and later re-sinking it).
Their relationship becomes strained once Balthazar discovers Castiel's alliance with Crowley. Unable to stop Castiel himself, Balthazar becomes a double agent for the Winchesters and eventually betrays his brother, by giving Sam and Dean Castiel's location.
Castiel then sees his brother as a loose end, and decides to lure Balthazar to a location under the guise of talks before stabbing him to death with an angel blade. Castiel regretted Balthazar's death since he was the last one of his friends and they shared a deep bond.
Castiel and Bartholomew
In Heaven, Castiel and Bartholomew were in the same garrison and fought together. Bartholomew was in awe of Castiel and his abilities, but after the fall of the angels, sent other angels and rogue Reapers to hunt Castiel down. With the help of a warding tattoo and Sam and Dean, Castiel managed to avoid Bartholomew's attacks, but was later captured by his followers. To Castiel's surprise, Bartholomew greeted him warmly, even hugging him, having apparently put aside his former anger at Castiel. Bartholomew offers his brother the chance to help organize the angels under his rule and retake Heaven, believing that together they can do it. Bartholomew also offers Castiel the resources to track down Metatron, which nearly convinced Castiel.
|“|| Bartholomew: Castiel, get your head out of the sand. Do you know why they brought you back from the battlefield? The truth? [...] Our leaders wanted those captives killed, and they knew you'd stand in the way of their order. Said you didn't have it in you. That you couldn't do what needed to be done. But I know different. I know you've changed.|
Castiel: I'm not a murderer.
— Bartholomew and Castiel
However, when Bartholomew tortures an angel and refuses to stop killing even innocent peaceful angels, Castiel refuses to help him, declaring that he wants no more part of slaughtering angels. When Bartholomew attacks him, Castiel is able to overpower his brother but refuses to kill him. However, when Bartholomew attacks him while his back is turned, Castiel is forced to kill him in self-defense. In the aftermath, Castiel's unwillingness to kill and wanting to do things a different way causes some of Bartholomew's followers to see that there is a different way and decide to follow Castiel instead.
Castiel and Claire Novak
Claire's father Jimmy Novak is the chosen vessel of Castiel. Shortly after Dean was rescued from Hell, Castiel communicated with Jimmy and promised his family safety in exchange for possession. Jimmy agreed. Claire came outside the house just after Castiel entered Jimmy, and was coldly informed that he was not her father. Claire watched Castiel walk away, taking her father with him.
Claire was briefly reunited with her father when Castiel was forcibly removed from his vessel, as shown in The Rapture. When demons attack the family, Jimmy pleads to Castiel to help save them. While Claire is tied up, she is approached by Castiel (presumably in a dream) and asked to assent to possession. Claire agrees, and Castiel defeats some of the demons while possessing her.
Castiel intends to keep using Claire in order to spare Jimmy of the torment of being a vessel, but Jimmy refuses. Castiel accepts Jimmy's decision and returns to his former vessel, leaving Claire and allowing her to return to her mother.
Life for Claire becomes difficult after that. Her mother Amelia goes in search for her husband, leaving Claire mostly in the care of her grandmother and later a Group Home. She becomes rebellious and holds a fair bit of hatred towards Castiel. The two do not meet again until a couple of years later, after Hannah inspires Castiel to go check on the Novaks, only to find what a mess they are in.
Claire is initially hostile, but does admit Castiel has become a slightly better person. Castiel is shown to be protective over Claire. When Claire gets into trouble, Castiel does all he can to save her, acting like a father to her, though Claire does not wish him to act as such. When Claire requests for help in finding her mother, Castiel gets Dean and Sam to partake in the search. After finding her, Claire thanks Castiel for helping her as he goes in search for what abducted her mother. This leads to a confrontation with the Grigori Tamiel and Amelia's subsequent death, though Castiel saves Claire from being killed. In return, Claire saves Castiel from being killed by the rogue angel.
Despite not getting her mother back, Claire finally accepts Castiel, and before departing to go live with Jody, she hugs him goodbye. She takes with her a birthday gift from Castiel, which is a Grumpy Cat toy. She is shown to still have it in Don't You Forget About Me.
Although there has since been any interactions between Castiel and Claire, Season 15 shows that Castiel still cares for Claire twice: in an alternate reality where God was trapped and Castiel became the bearer of the Mark, causing dark forces to prevail over light and making monsters dominant, Castiel was visibly distraught upon learning of Claire's death and appeared disrequited to learn about Claire's murderous desire for revenge over Dark Kaia and concerned how she would take it if they failed to rescue Kaia.
Castiel and Daphne Allen
After he was resurrected following an explosive death at the hands of the Leviathans, Castiel was found, naked and by the lake, by a woman named Daphne. For reasons unclear, Castiel had no memory of who he was. Daphne took this encounter as a word from God and took care of Castiel, now named "Emmanuel", and soon married him.
Castiel and Daphne lived a relatively peaceful and happy life for months, during which Castiel re-discovered his ability to heal people and Daphne helped with contacting clients. Eventually, Castiel's acts as a healer attracted Dean Winchester, as well as demons, to their home. Dean defeated the demon who was threatening Daphne and was reunited with Castiel, though Castiel had no clue who he was.
Dean urged Castiel to help his brother Sam who was at the hospital, and Daphne permitted him to do this. After Castiel left, Daphne never saw him again, as Castiel would regain his memories in his mission to save Sam Winchester.
Out of Castiel's three lovers, Meg and April, Daphne is the only one with whom Castiel had a successful relationship, as Meg was killed approximately a year later and April was a reaper tasked with killing him. It is unclear if Castiel remembers Daphne, or whether he cares about her at all.
Castiel and Duma
Before the events of War of the Worlds, Castiel appeared to like and trust Duma to the point that he called upon her for information on Jack and met with Duma alone at the Heavenly Portal. Castiel was shocked to learn the truth about the angels being an endangered species from Duma and what they planned to do with Jack if the angels got their hands on him. When Castiel refused to help them, Duma brought in two more angels to help her. Castiel shoved Duma away from him and fought all three at once before all the other angels were scared off by the arrival of Lucifer.
In Funeralia, Castiel greets Duma and some other angels in an unthreatening manner in Heaven to get their help with finding the still living Gabriel and warning her about the invading Alternate Michael. When Duma returned and admitted that they couldn't help him, Castiel got angry and demanded they help until Naomi arrived to explain the situation to him.
In Byzantium, Castiel was worried when he found Duma unconscious during the Invasion of Heaven and they worked together to find Jack. Castiel was shocked to find out that Duma had been possessed by the Shadow and freed her and the other angels from its control by making a deal with the entity. Duma appeared to retain no memory of the experience and was surprised to find Castiel in Heaven.
In Absence, Duma responded to Castiel's calls for Naomi and rather rudely rebuffed Castiel's questions about Naomi's location. However, Duma explained to him that Mary Winchester was dead and at peace in a special Heaven with John Winchester and allowed Castiel into Heaven to view it. Castiel later admitted that he didn't believe Duma until he saw it for himself.
In Jack in the Box, Castiel was shocked to learn that Duma had overthrown Naomi to become the new Ruler of Heaven, but was willing to work with her to find Jack. After learning of the way Duma was twisting Heaven and manipulating Jack, Castiel lost all trust in his sister and openly confronted Duma over her actions in Heaven. When Duma tried to stop Castiel from getting to Jack, Castiel openly challenged her on whether or not she actually wanted to try fighting him again. Rather than fighting Castiel, Duma tried sway him to her cause since Jack was creating more angels to fuel Heaven. He appeared to consider it but refused to let her guide Jack. She then attempted to play on his care for the Winchester Family by ending John and Mary's shared Heaven with a snap of her fingers. However, instead of capitulating, this proved to be the last straw for Castiel who instantly killed Duma with his angel blade, ending her reign of terror and ensuring the safety of John and Mary. Aside from a brief glance at Duma, Castiel showed no reaction to killing another of his siblings and showed no remorse for his actions.
Castiel and Gabriel
The archangel Gabriel was Castiel's older brother and the two seem well acquainted with one another. In their first onscreen appearance together in Changing Channels, Gabriel was trying to manipulate Sam and Dean into saying "yes" to Lucifer and Michael respectively, but he had to keep Castiel out of the way since Sam and Dean did not know his true identity yet. Gabriel's ability to knock Castiel aside and send him away with ease, as well as their apparent familiarity with each other became one of the two pieces of evidence that gave his identity away anyway. Once Gabriel's identity was revealed, he was forced to bring Cass back and the two brothers tensely greeted each other with Castiel showing annoyance after Gabriel mocked his search for their father.
It is unknown how close the two brothers were back in Heaven, but Gabriel is the only one of the four archangels never to make an attempt on Castiel's life, or have a reason to. They do not see each other again after Changing Channels, but an illusion of Gabriel crafted by Metatron does interact with Castiel in Meta Fiction. This Gabriel displays protectiveness, trust and care in Castiel, as most loving older brothers would. Castiel in turn, showed trust and concern for Gabriel too until he discovered that he wasn't real.
Judging by Castiel's relationship with the illusion of Gabriel, it is clear that Gabriel is one of the few angels who actually likes Castiel but, to Castiel's dismay, he was presumed dead like many of his loyal friends and siblings. However, Castiel did inquire if he was really dead and only gets a vague answer from the illusion.
In Bring 'em Back Alive, Castiel is reunited with his older brother and is dismayed at his state and tries his best to bring him to his senses but believed it was in vain. He reads Gabriel's message and learns the latter faked his death to avoid having tethers, during the Apocalypse. Castiel also learned of Gabriel's captivity by Asmodeus and torture by Asmodeus. Once Gabriel speaks and regains his powers, Castiel is relieved that he is back to normal. Gabriel later saved Castiel and Sam from being killed by Asmodeus by incinerating the demon. Afterwards, Castiel caught him up on everything that has transpired but was dismayed that Gabriel wanted no part in it though wished them luck. Castiel begged him by telling him not to walk out on their father's work but his pleas are ignored as Gabriel left. Castiel swore to Dean that they'd find Gabriel again.
During Funeralia, Castiel continued to search for Gabriel even going to Heaven for help. After he saw Heaven's state and learned of its impending destruction, he became even more determined to locate his brother to get him to Heaven.
In Unfinished Business, the Winchesters tracked down Gabriel and after helping him in a task he decides to join them. After returning to the bunker, Gabriel was helped in settling in by Castiel.
During Beat the Devil, while they journey through Apocalypse World Castiel told Gabriel about Heaven's state and if he ever will return. While Gabriel is shocked to hear of this, he considers it since he had previously abandon it centuries ago and Castiel gives him encouragment.
In Exodus, Castiel and Gabriel had little interaction but they both told Jack not to trust Lucifer. The last time they see each other is in the evacuation of survivors, Castiel was one of the few to cross over while Gabriel stayed behind. Castiel felt grief and sadness after hearing from Sam and Dean that Gabriel was killed by Michael but took solace in the fact Gabriel's efforts weren't in vain.
During Let the Good Times Roll, Castiel recalled his brother's death after Michael appeared in the world and tried to attack him, despite knowing what power Michael holds. This showed Castiel truly cared for his older brother and was hurt by his loss.
Castiel and Gadreel
Before their first meeting, Castiel had heard stories about Gadreel, the angel who was assigned to protect the Garden of Eden, only to fail by letting Lucifer in, causing all the disastrous events that followed. Castiel held some resentment towards Gadreel, blaming him for The Apocalypse and for many of the struggles of he had to face because of the angel's failure.
When Gadreel approached Dean and offered to heal Sam through possession, Dean called Castiel to ask if this angel was trust worthy. Since Gadreel was using the name of another angel, Ezekiel, as an alias, Castiel assured Dean that the angel could be trusted.
While posing as Ezekiel, Gadreel resurrected Castiel after he had been killed by the rogue reaper April Kelly though he later told Dean to get Castiel away to hide his identity and protect himself (and by extension Sam).
After Dean realized "Ezekiel" was a traitor and needed to be removed from Sam's body, he had Crowley crack into the angel's factory settings, causing Gadreel to reveal his true name. This set Castiel off into a fit of rage, stopped only by Dean's insistence that their priority was to free Sam.
The two became enemies immediately after due to Gadreel's alliance with Metatron. In an attempt to find the angel's current location, Castiel decided to extract the residue of Gadreel's grace from within Sam, but he chose to abandon this task in favor of sparing Sam, as the grace's removal would revert Sam back to his ill-condition prior to the possession.
Castiel gets captured by Metatron sometime later, but he is set free when the Winchesters manage to capture Gadreel. The two sides agree to make a trade. Later on, Castiel approaches Gadreel and urges him to realize that he is making the same mistake again by following Metatron, but Gadreel refuses to listen, since he cannot surrender his honor. Although his doubts about Metatron grow, he rejoins Metatron soon after and resumes recruiting followers for Metatron's faction.
Metatron then orders Gadreel to force some of Castiel's angels into becoming explosives and using them to kill Metatron's own men, in order to make Metatron look like the victim. While the plan does work, the cruel sacrifice of his own followers drives Gadreel to acknowledge his own mistake. He flees Metatron's side and returns to Castiel. Convinced of Gadreel's sincerity, Castiel agrees to work with Gadreel in infiltrating Heaven and locating the angel tablet, the source of Metatron's power. Castiel offers to pretend to be Gadreel's prisoner, but once they arrive in Heaven, the angels lock them up, not fooled by their guise.
Castiel tries to plead with Hannah to see the wrong in Metatron, whom she now follows. During their conversation, Gadreel chooses to commit suicide to repent for his sins and to give "Heaven a second chance", as well as free Castiel from the neighboring cell. Despite Hannah's pleas, Gadreel sets a bomb off on his chest and destroys part of the prison, freeing Castiel and convincing Hannah on who is the real enemy. It is Gadreel's death that ultimately helps Castiel in exposing Metatron's true nature to the rest of Metatron's followers, leading to the latter's imprisonment. It is safe to say that Castiel is grateful for his brother's sacrifice and no longer thinks poorly of him. During their time in the cells, Castiel also refers to Gadreel as his friend and tells him that he has redeemed himself before learning of Gadreel's intention to sacrifice himself.
Castiel and God
|“||Castiel: He's a writer, writers lie.||”|
Until recently, Castiel had never met God, but followed his orders out of faith. He was obedient until Dean began putting doubts in his head as to who was really giving the angels their orders. Castiel had always followed orders to the best of his abilities, believing them to be passed down to him from God.
During Season 4, he unknowingly meets God who was pretending to be a prophet named Chuck Shurley that had been writing books about the Winchester's heroics, which he seemed to support. While under the guise as Chuck, he noticed Castiel's worried facial expression and appeared to show a level of pride and concern in Castiel for his rebellion and what would happen to him, as he placed a hand on his shoulder when he prepared to deal with Raphael as if to encourage him but removed it when Castiel gave him a look.
In Season 5, Castiel is resurrected by God after Raphael kills him and Castiel uses this to intimidate Zachariah in leaving the Winchesters alone. Castiel eventually rebels against Heaven and helps the Winchesters by looking for God in order to stop Michael and Lucifer, using Dean's Amulet. In this time, he earns mockery from his siblings for the seemingly pointless search and becomes severely disenchanted when being led to believe God simply doesn't care about the state of things anymore after the Winchesters spoke to Joshua.
Unlike any angel, Castiel has been brought back to life many times, and he assumes that God himself has revived him which Joshua confirmed. To reward his role in averting The Apocalypse, God increases Castiel's power and upgrades him to a Seraphim.
While working with Crowley, Castiel asks for God's help, but God doesn't respond. Following this failure to get God's notice, and other previous failures, Castiel takes many souls into himself (including the Leviathans), and declares himself the new God. Power drunk but well meaning, he quite possibly becomes the greatest threat that the world has ever known.
Despite what Castiel had did, unleashing the Leviathans after he failed to return them to Purgatory, God ressurects Castiel once again but while God brings him back with his powers intact, for some reason God buried Castiel's memories for some reason but he clearly didn't erase them, as Castiel was able to regain his memories by vanquishing demons.
During a talk with Dean, Castiel reveals that he now believes that this revival and other resurrections are a punishment that gets worse each time, and that if he dies again, God will continue to bring him back for more punishment.
In Don't Call Me Shurley, God confirms to Metatron that he is the one who kept resurrecting Castiel. He tells Metatron "I've rebuilt Castiel more times than I can count" but adds that "look where that got me." Metatron also believed that Castiel was nevertheless God's favorite angel as he brought that up to him but God's tone and facial reaction implies that he is somewhat disappointed in Castiel for his actions.
As Lucifer's vessel, Castiel becomes aware of God's return and helps in recruiting the angels for God's battle against the Darkness. After Amara banished Lucifer from his body in Alpha and Omega, Castiel formally meets his father face to face for the first time as Chuck. He helped God up and worried for his well being after he had been wounded by Amara and supported his plan to defeat her and remains mostly by God's side following the battle's failure. Castiel sat relatively close to God inside the bar the team gather in while Dean goes on a mission as a ticking time bomb. He notices belatedly when God disappears from the room after being teleported by Amara. Despite being in God's presence for most of the episode, Castiel is not shown to interact with him one-on-one.
With his meeting, Castiel is one of the seven angels (the archangels, Metatron and Gadreel) to see God.
As shown in Bring 'em Back Alive, even after his departure from Earth that Castiel still holds respect for God as he told Gabriel not to turn his back on his father's work.
In Nihilism, Castiel shows that even though God has never helped the Winchesters ever since the war with the Darkness, he still respected and held faith in God, as he clearly dissaproved Michael's belief that Michael and Castiel's worlds were just failed drafts and was disgusted by his nihilistic desire to destroy all worlds and then catch up to and kill God.
During Game Night, he seeks Anael for help in contacting God to find a way to restore Jack's lost soul. Castiel is disenchanted with her regard of their father not caring about them but he did seem to consider them. However, he defended God by stating that the latter brought him back to life. Castiel nearly gave up on trying to contact God but after finding the charm, he quickly spoke to God and begged him for help in saving Jack. When God did not seem to reply, Castiel appeared to give up.
In Moriah, God appears to Castiel and he is shocked to see his father again before he learns that God did hear his prayer. They make small talk and God teleports them to the Winchesters and after cancelling out Jack's influence on everyone, God reveals that he can't help Jack. Castiel is surprised especially when God reveals that the only way to stop Jack is to kill him. Castiel grew wary of God's intentions and couldn't believe that the Winchesters would follow a mad plan, resulting in him leaving the bunker. They meet again and he watches Dean refuse to follow out God's order but is horrified to watch him kill Jack. Castiel's faith was utterly shattered and he bitterly stated that Chuck lied just as every writer but this was the least of his concerns, as God decided to destroy everything to punish everyone for their defiance of him. Castiel also prepared to fight the undead God set upon him and his friends.
Castiel would spent the next season utterly enraged at God and dedicated to his defeat over his murder of Jack. He expressed that his anger at God was no less than that of Dean and tried to encourage Dean to take action against God.
However, Castiel still acknowledged God's power even after learning of his diminished state, stating that he and Dean would be no match for God without the Primordial Entity Trapping Spell Michael gave them. He had to turn his older brother against their father by showing him the truth of God. He also chose to bear the Mark to keep God locked away. Unfortunately, as it turned out, even Castiel's angelic status, just as Lucifer's archangel status failed with Amara, could not withstand his father's power and God was able to corrupt Castiel into going mad in the future, forcing Dean to bury him alive in the Malak Box, which all but ensured the Winchesters defeat against the monsters that were now able to dominate hunters as it was God that kept darkness from overwhelming light. This effectively eliminated any desire to trap God as Sam allowed God to destroy the spell but Castiel remains determined to find a way to defeat God. He even went as far as to allow Jack to eat the hearts of the Grigori to gain the strength to kill God, which astonished Dean.
Castiel and Hannah
Castiel meets the angel Hannah after the angels were banished by Metatron's spell, and lured to a location by a noise. Hannah was the sole survivor of a group of angels who refused to join Metatron's side, the rest were killed by Gadreel. Hannah initially attempts to kill Castiel, but is defeated and chooses to join his side.
When Castiel decides to build his army, Hannah acts as his second-in-command. This alliance is shattered when Metatron tricks the angels into losing faith in Castiel, blaming him for the suicide bombing. Hannah does not rejoin Castiel's side until Gadreel sacrifices himself, proving Castiel's cause to be just. Together they are able to overthrow Metatron and re-take Heaven.
Hannah later assists Castiel in gathering rogue angels. Hannah shows concern for Castiel's dwindling grace, but is repeatedly brushed off. An encounter with the husband of Hannah's vessel convinces Hannah to abandon her vessel and return to Heaven, leaving Castiel to continue the search alone, but also inspire Castiel to find his own vessel's family.
Castiel meets Hannah again in a new vessel when Castiel attempts to break Metatron out of prison. Hannah is unsupportive of this plan, but ultimately fails to stop her friend due to Bobby's assistance from the inside. Castiel meets Hannah for the last time following the rise of Amara. Hannah partakes in interrogating Castiel on Metatron's whereabouts, but soon chooses to believe that he does not know. Enraged, Efram kills Hannah. Castiel is left deeply saddened by her death and is angered enough that he immediately avenges Hannah by killing Efram for his actions.
Hester and Inias are two angels from Castiel's garrison who appeared in Reading Is Fundamental, with the intention on getting their hands on the newly-designated prophet, Kevin Tran. Both angels were shocked to discover that Castiel was alive, since he was thought to have died after he let loose the Leviathans some time ago.
Hester, the new leader of the garrison, was furious with Castel over the genocide of Raphael's followers, which cost Heaven thousands of angels. After delivering a "big, scary speech", Castiel had vanished. Hester wanted an explanation, but soon realized - along with Inias - that Castiel had lost his sanity.
All three were blasted out of their location by Dean before things could escalate. Castiel managed to return to the Winchesters soon after, though after Meg killed a demon near Rufus' cabin, Hester and Inias were able to track them to their new location.
Hester proclaimed that Castiel had fallen in every way possible, ever since the day he had rescued Dean from Hell. In a fit of rage, Hester assaulted Castiel until he bled. Inias tried to stop her, insisting that there were few angels left, only to be knocked aside. Hester's beatings were stopped when Meg stabbed her in the back with an angel blade, killing her.
Hester would not be the last angel to desire vengeance upon Castiel, and Castiel himself would come to regret every one of his sins mentioned by Hester, from his tenure as God and later on, his part in helping Metatron banish the angels from Heaven.
Inias, on the other hand, became one of the very few angels to care for Castiel, enough to want to welcome him back to the garrison, though Castiel ultimately declined. What exactly became of Inias is unknown, though Castiel believes his entire garrison has been wiped out.
Castiel and Ishim
Ishim, like Anna, was Castiel's superior for a time. In 1901, Ishim convinced Castiel along with a group of other angels that the Seraph Akobel had fathered a Nephilim. The group arrived at Lily Sunder's house and murdered Akobel, while Ishim chose to kill the abomination himself. Although Castiel was not entirely comfortable with the task, he trusted Ishim and believed, for the following hundred years, that he and his siblings had done the right thing.
In 2017, Lily sought revenge against all the angels involved in her daughter's death. Castiel was horrified to learn that Lily's daughter May had been an ordinary human and that Ishim had lied to him, leading to the deaths of many angels and putting innocent blood on Castiel's hands. For a time after their reunion, Ishim seemed to care for Castiel still, despite the latter's involvement in the Fall of the Angels, which damaged Ishim's wings. However, as with Lily, Ishim was possessive, demanding as well as manipulative of Castiel, who finally saw his true nature. Ishim turned on Castiel and ruthlessly beat Castiel. Ishim stated his envy of Castiel, since he was chosen by God and obtained great power but called him pathetic. He decided to help him by killing Dean, as he saw Dean as Castiel's weakness but before he could kill him, he was interrupted by Lily. However, it would be by Castiel's own hands that Ishim met his end, something Castiel had threatened to do to his other superior Anna, but never did, although while he stated that he did not want to kill Anna unless truly forced to, Castiel showed no remorse for Ishim's death.
Aside from Ishim's position as Castiel's superior in both power and rank, it is not clear what their relationship actually was like. Ishim seemed to prefer Castiel's female vessel and in 1901, he appeared to trust Castiel as well. The revelation of Ishim's true nature certainly damaged any positive opinion Castiel ever had of Ishim.
Castiel and Jimmy Novak
After Castiel rescues Dean from Hell, he realizes he cannot communicate with the human unless he obtains a vessel. Castiel tracks down Jimmy Novak, a devout Christian and family man who is able to receive Castiel's messages and communicate with him. The two manage to develop a sense of trust but Jimmy's behavior is met with ridicule by his wife.
Forced to work for Castiel, Jimmy assents to possession and becomes Castiel's vessel for months. The experience is rather unpleasant for Jimmy, who feels like he's "being chained to a comet". Castiel does not alter Jimmy's appearance, simply adding a deep voice as the only indicator that the two are not the same person.
Eventually, Jimmy is freed from possession when the angels decide to drag Castiel back to Heaven for rebellious behavior. Sam and Dean discover Jimmy, who informs them that he no longer wishes to have anything to do with angels, his earlier excitement gone due to the torment he suffered, and his desire to be with his wife and daughter again.
Unfortunately, Jimmy's fate was sealed from the moment Castiel first spoke to him, as his status as an angel vessel drew demons to his family, leading to the possession of his wife and neighbors, and an attempt on his life. Jimmy demanded Castiel to rescue his family as part of their deal to gain Jimmy's consent. Castiel obeyed and took Claire as a vessel while smiting the demons holding the family captive.
Castiel was sympathetic to Jimmy's suffering and offered to spare him of the ordeal and take Claire instead, but Jimmy's love for his daughter drove him to take Castiel back, an act which ultimately cost Jimmy's life when the pair were killed by Raphael.
God resurrected Castiel and presumably Jimmy as well since he was mentioned by the angel. After Lucifer killed them again, Castiel is given Jimmy's body to use permanently by God, while Jimmy ascended to Heaven.
Years later, Castiel would attempt again to keep his promise to protect Jimmy's family, he tracked them down only to discover that not only had he ruined Jimmy's life, but also caused the break up of the remaining Novaks, with Amelia having gone searching for Jimmy and leaving Claire in bad company.
Eventually, Castiel would remedy this situation and find Claire a better home, while Amelia died and went to Heaven, reunited with Jimmy at long last.
Castiel and Lucifer
When Lucifer rebelled against Heaven, Castiel (a newly created angel at the time) remembers being terrified by the raging archangel. Despite this, Lucifer does know of Castiel and sees him as a brother. When they meet again, which is after Castiel himself rebelled against Heaven, Lucifer traps him in a ring of Holy Oil. Lucifer tries to persuade Castiel to work with him by listing things they have in common. Castiel refuses to listen and is subsequently left in the circle while Meg stays to watch over him so that he doesn't manage to free himself.
The two meet again at Stull Cemetery, where Castiel banishes Michael using holy oil. This enrages Lucifer, who smites Castiel as punishment. God resurrects Castiel, shortly after Lucifer has been imprisoned in his Cage by Sam. For the following two years, Castiel makes certain Lucifer does not escape his prison.
When choosing to take on Sam's insanity, Castiel was tormented by the visions of Lucifer greeting him. Very soon, Lucifer left Castiel's mind but he was still insane until he and Dean went to Purgatory.
Lucifer does not re-enter Castiel's life until six years after their previous meeting. Sam is trapped in Limbo with Lucifer assaulting him, so Castiel joins Dean in trying to fend off the archangel. Their combined effort is not enough to defeat Lucifer. During the fight, Castiel becomes convinced Lucifer can stop The Darkness just as he claims, and Castiel consents to possession right before Rowena finishes the spell intended to send Lucifer back to his Cage. It is unknown if Castiel was even aware what Rowena was doing.
Regardless, Lucifer is anchored to Earth with Castiel as his vessel. Using Castiel, Lucifer is able to reclaim the throne of Hell and briefly takes Heaven.
How Castiel was treated while used as a vessel is unclear. When Lucifer attempted to kill Sam in The Vessel, Castiel fought back to keep the archangel from hurting his friend, but gave control back so Lucifer could time travel and save Dean. When Crowley enters Castiel's vessel in Hell's Angel, he finds that the angel is suffering from depression, and is likely got "hooks" inside him. Castiel tells the demon that Lucifer mostly just leaves him alone.
Lucifer remains mostly in control afterwards, though he does not seem to prevent Castiel from discovering what is going on outside, as Castiel becomes aware of God's return and God's plan to defeat The Darkness. Lucifer allows Castiel brief control of their shared vessel when the angels choose not to listen to the archangel, in hopes they would instead listen to Castiel.
The battle ends in God's defeat and when Lucifer attempts to rescue God from Amara's clutches, but is knocked aside and ripped from his vessel. Castiel wakes up shortly after, uncertain of his older brother's whereabouts. He later informs Dean that he was stupid for saying "yes" and that he was only trying to help.
In The Foundry, Castiel discovers traces of Lucifer's whereabouts and, still feeling guilty about releasing the Devil from his prison, decides to go after him alone. Crowley soon joins in since he knows more about Lucifer's current vessel. The two manage to track Lucifer down to a cabin in the woods, but fail to find him since Rowena had banished him away earlier.
When Lucifer announces his plan to host a concert in Los Angeles, Castiel relies on Tommy to give him the location. He, Sam, Dean and Crowley track Lucifer down to Club Meteor to prevent the slaughter of Vince's fans. Castiel joins Crowley in fighting against Lucifer. The archangel taunts Castiel about his lack of self-worth, noting how he knows this since he was once inside the angel, and proceeds to beat both him and Crowley to the ground. Enraged, Castiel follows Lucifer to the stage and tries to attack Lucifer again, only to be disarmed by telekinesis.
Alongside Dean and Sam, Castiel listens to Lucifer's declaration that he will destroy God's toys while making the three of them watch, since he finds the act of slaughtering to be "fun". Castiel is disgusted by this and intends to stop Lucifer anyway he can. He joins Sam and Dean in hunting down Lucifer who has taken possession of the President. Castiel is mortified when he discovers Lucifer has also impregnated said president's lover, Kelly Kline, and makes an effort to try and convince Kelly to abort the child.
After Lucifer is finally defeated, Castiel continues to hunt down Kelly and the child out of fear that the child will wreak havoc. Over time, Castiel comes to realize the child might not be born purely evil, but he is unwilling to take the chance. Lucifer's son, on the other hand, seems to favor Castiel over his former protector Dagon, and grants Castiel the powers to kill Dagon. The child seemingly instructs Castiel to become Kelly's new protector, and has somehow convinced Castiel that the child himself is indeed good.
When Lucifer, actually imprisoned in Crowley's lair at the behest of Crowley, finds out Castiel is with his son as opposed to Dagon, he screams in rage. Immediately after escaping the lair, Lucifer hunts down his son and locates Kelly at a house by the lake. To his misfortune, Sam, Dean and Castiel once again stand in his way. In the ensuing fight, Lucifer manages to kill Castiel using an angel blade, but gets trapped in an alternate reality by Mary Winchester.
|“|| Castiel: The last time we were together, you killed me.|
Lucifer: The last time we were together, you stabbed me.
— Castiel and Lucifer discuss their last meeting
Following Lucifer's return to the main reality, he rescues Castiel from three hostile angels though it costs him a great deal of energy in his weakened state. Castiel was shocked and angered to see his brother again, nearly killing him for revenge for his previous deaths but Lucifer who was surprised to see Castiel resurrected, stopped him as he wasn't that weak. They talked explaining how they are both back after their previous encounter as Lucifer tells him of an impending threat. Following this, Castiel reluctantly sits with Lucifer to talk about Jack despite their differences, apologizing sarcastically for stabbing Lucifer the last time they met. Before Asmodeus captures them, Castiel appears to be willing to put aside his differences with Lucifer for Jack's sake and due to the threat of the alternate Michael.
While held captive by Asmodeus, Castiel and Lucifer develop an exasperated banter with Castiel often chastising Lucifer over his useless threats and Lucifer attempting to get Castiel to give up some of his grace to restore Lucifer's powers. Castiel also takes the opportunity to describe Jack and what he is like to his father, noting that Jack looks more like Kelly than Lucifer. After discovering that rage allows Lucifer to access some of his powers, the two rogue angels team up together to escape, taking down Dipper together and then fighting side-by-side against four more demons and winning. However, Castiel continues to refuse to trust Lucifer given the fact that he trusted Lucifer when they fought the Darkness together and Lucifer betrayed him. After Lucifer tries to take Castiel's grace by force, promising to leave Castiel some, Castiel impales Lucifer with an angel blade, apparently causing Lucifer harm in his weakened state. Castiel tells Lucifer that his actions are Castiel "learning from my mistakes."
Lucifer escaped this event Castiel searched for him but lost sight of him and collapsed from his injuries. Despite this betrayal, Castiel believed Lucifer's warning of Michael as he saw the fear in his explanation of the latter and didn't hesitate to warn the Winchesters as well.
After locating him, Castiel gave Lucifer an angry look after the latter was relieved to see him alive. Lucifer was nearly captured but with help of Anael, he was able to overpower and torture Castiel and the Winchesters before Ketch came to their aid.
During Beat the Devil, they met again when Gabriel and Rowena capture the archangel. Castiel personally cut Lucifer's throat to fuel the rift. Castiel was later horrified to see Lucifer in Apocalypse World after the latter resurrected Sam and coerced him into bringing him to Jack.
In Exodus, Castiel was still shocked to see Jack but has Lucifer submit to Supernatural Handcuffs, he escorts him through camp. Castiel refused to help him bond with Jack and becomes worried when Jack decides to talk to Lucifer and hear him out while a smug Lucifer works at building a relationship with his son. Castiel also found himself agreeing that Lucifer couldn't spread evil while trapped in Lucifer's Cage.
Their final meeting was in the bunker where Castiel who just awoke from being attacked by Michael. Castiel was angry at this sight and even criticized him for trying to take Jack and leave the rest of them to suffer at Michael's hand. He then witnessed Lucifer stealing Jack's grace to empower himself and worried at the fate of Jack and Sam.
Despite his desire to stop his brother, he was dead-set against the idea of Dean letting Michael possess him as he recognizes that even if Lucifer were to be defeated, Michael would just take over Dean and begin a reign of terror. While seemingly aware that Lucifer would die, any relief and satisfaction he felt about it was extinguished entirely by his concern for Dean now being used as a vessel for Michael.
Castiel and Mary Winchester
Castiel's thoughts and opinions on Mary during his time with Dean are non-existent, though in Season 5, Castiel does assist the brothers in time travelling to the past in order to protect Mary from his former captain turned-enemy, Anna Milton. As he is weakened by the journey, Castiel does not get to meet Mary.
Castiel and Mary meet face to face in Season 12, when Castiel returns to the Bunker after being banished by Lady Toni Bevell. There, he encounters a hostile Mary, but also Dean, whom he thought had died in his mission. Dean introduces Castiel to Mary, describing him as an angel with a harp, which Castiel denies having while she is shocked to see an angel. Castiel was surprised at her resurrection by his aunt's hands. Despite their turbulent meeting, Mary comes to accept Castiel as part of the family, and together they go and rescue Sam from the British Men of Letters.
Castiel and Mary share a mutual understanding in what it is like to live in a place one is unfamiliar with. Despite years of living as a rogue angel and a family friend of the Winchesters, Castiel does not feel like he truly belongs, similar to Mary, who has lost 33 years of her life and cannot cope with the loss of her husband and the change in her sons. Castiel insists Mary does belong, but she kindly brushes him off.
For a time, both Castiel and Mary split from Sam and Dean. Castiel seeks to undo his mistake of freeing Lucifer by capturing him, while Mary seeks to find a means to adapt in this strange new world by being on her own. When they both finally return to the Bunker, Mary is horrified to learn that Castiel has lost track of Sam and Dean and accuses him of not doing his job. The two are forced to wait for days for a call that may never come. When Alicia Banes calls for help on a werewolf case, Castiel fails to complete it, so Mary takes over and finishes it.
After six weeks, the two meet again and she apologize for her words though he acknowledged she was right. They then decide to work with the British Men of Letters, specifically Arthur Ketch and Mick Davies. The two men help them find Sam and Dean's location, tracking them after Dean had finally called Castiel. Mary and Castiel are reunited with Sam and Dean just outside Site 94, but on their way back, they are intercepted by Billie the Reaper, who reveals that Dean had made a deal to sacrifice himself in order to escape the prison. Mary offers to go to The Empty to spare both her sons, but Castiel doesn't allow it, and kills Billie to spare all three Winchesters of death. Mary and her sons were shocked by his actions as he states they mean too much to him and he can't afford to let them die.
Like her sons, Mary has taken to befriending Castiel, even calling him Cass like they do from time to time.
When Mary chooses to work for the British Men of Letters, she is given the task of stealing The Colt from Ramiel. She convinces Sam, Dean and Castiel to join her by saying that she simply needs help killing this powerful demon. The three go along with her, but the plan somewhat backfires when Ramiel attacks Castiel using the Lance of Michael. Mary comes to his aid and is upset after Castiel is left dying. Castiel is saved when Crowley destroys the Lance, but when Mary returns to Arthur Ketch she expresses her disdain, noting how the mission nearly cost her one of "her boys", meaning Castiel, whom she now regards as family.
In Various & Sundry Villains, while captured Castiel inquires from Lucifer about the Alternate Michael and is made aware that Michael has Mary and is torturing her before he angrily cuts Lucifer off from telling him more.
After escaping, Castiel informs the Winchesters of Michael's invasion and when asked about Mary, he could only tell them she was while holding back some of the details of her status but the brothers see through it and become determine to save her.
During Good Intentions,Castiel would work with Sam and Dean on gathering the ingredient for the spell to open the rift and resort to ripping them from Donatello Redfield's mind, after listing Mary as one of the people he loves. This shows he now considers her to be family as well.
In Bring 'em Back Alive, after Dean returned from Apocalypse World Castiel asked him where Jack and Mary were and was relieved that Michael doesn't have them.
In Beat the Devil, Castiel and the others open a rift and travel through Apocalypse World. After traveling through the world and finding the human camp, they meet with Mary who Castiel is happy to see as she surprised to see him and takes them to see Jack. The happy reunion is broken up by Lucifer's arrival.
In Let the Good Times Roll, when Michael invades the bunker Castiel and the others have Mary retreat even though she is reluctant. After Dean becomes Michael's vessel, Castiel sadly sits down as Mary and Bobby approach him, Castiel simply shakes his head in despair, as his reaction lets her know what had happened.
In Absence, Castiel is as devastated by her death as Sam and Dean and travels to Heaven to find her soul for another resurrection. Castiel was comforted by the fact that Mary was truly at peace in a shared Heaven with John Winchester. In a flashback during the episode, Castiel and Mary finish up a vampire hunt together shortly after her resurrection and discuss her sons. Mary seems to imply that she's comforted by the fact that her sons at least had Castiel when they didn't have her.
In Jack in the Box, Castiel attends Mary's hunter's memorial alongside the other hunters that were her friends and family. After Bobby kills a Wraith that attends to gloat, Castiel notes that Mary would've appreciated her hunter's memorial complete with a monster which Bobby agrees with. Duma shows she is aware of how much Castiel cares for Mary by threatening to end John and Mary's shared Heaven with a snap of her fingers if Castiel doesn't comply with her. Instead, the threat to John and Mary causes Castiel to instantly kill Duma with an angel blade to protect them.
Castiel and Metatron
Castiel knew little of the Scribe prior to their meeting, having neither a negative nor a positive opinion about him. All he knew was that Metatron had created the tablets and knew all that was written on them, and Metatron used this knowledge to lure Castiel into trusting him.
By that point, Castiel was suffering from a deep sense of self-loathing, having just survived manipulation by Naomi, lost the angel tablet to Crowley and made Dean angry at him, Castiel's greatest desire was to atone for his sins, and Metatron offered him a solution: complete the three trials that would lock up Heaven, so the angels would no longer cause problems on Earth.
Castiel readily agreed, given that Sam was already doing the trials for locking up Hell. Castiel gathered various ingredients, but by the time Kevin Tran found out that said ingredients weren't listed on the angel tablet, Castiel was already one ingredient away from what Metatron needed for his master plan. Metatron captured the angel and extracted his grace, not to lock up Heaven, but to expel all the angels from Heaven so he could rule over it. Before taking his grace, Metatron told Castiel to live a human life by starting a family and when he dies tell him of his human life.
Castiel was banished to Earth, now human, as forced to watch as millions of his siblings fell to Earth with their wings being torn off. Castiel blamed himself entirely for falling for Metatron's trickery, and he wanted nothing more but to get back at Metatron. Metatron, on the other hand, wanted to make Castiel the villain of the story, and tried to use various methods to get the angels to turn against Castiel and work for him. During the talk, it is implied that Metatron genuinely wanted Castiel to live a full life as a human. This plan backfired when his unorthodox methods alienated his most trusted follower, Gadreel, who then sided with Castiel.
Gadreel helped Castiel get into Heaven where the latter intended to locate the angel tablet and destroy it, thus stripping Metatron of his power source. While Castiel searched Metatron's office, Metatron arrived and captured him, and proceeded to gloat about having murdered Dean, the human Castiel so dearly loved. Castiel was mortified, but he had, prior to being captured, turned on the radio. When Metatron also gloated about his true intentions and his lack of actual concern for their siblings, all the angels heard it, and proceeded to arrest Metatron and put him in prison.
This was not the last of Metatron, as Castiel was driven to retrieve Metatron from his prison in hopes that he knew the cure to the Mark of Cain. He did not, but he did know the location of Castiel's remaining grace. Despite losing the demon tablet, Castiel was able to regain what was left of his original grace and merge it with "borrowed" grace from Adina, and become a Seraph once again.
Metatron himself, during interrogation, was stripped of his own grace and rendered human, forcing him to suffer through mundane human problems for more than a year until Castiel found him, now working as a videographer. Castiel beat information out of Metatron in order to find out the identity of The Darkness. Metatron revealed that she was God's sister. Feeling that Metatron was too pathetic to kill, Castiel let him go. This was the last time to two ever saw each other.
Regardless, by letting Metatron live, Metatron ended up in hospital and discovered a new perception of life. He became nicer, more loving and less selfish. When God called upon him to become his editor, Metatron voiced jealousy at Castiel by calling him God's favorite, suggesting another reason for his dislike of him.
Metatron chose to demand God to help his creations from his rampaging sister, leading God to meet the Winchesters formally for the first time. It was Metatron too, who joined the rescue mission for Lucifer, who was by then in possession of Castiel's vessel. By taking part in this mission, Metatron helped to rescue Castiel as well. He died trying to buy the gang time to escape when Amara, who had been the one to imprison Lucifer/Castiel, returned to her lair. It can be assumed that Castiel had at least gained a better opinion of Metatron after his redemption, although whether he could forgive Metatron is unknown.
Castiel and Michael
|“||You know, Michael...I never really liked you. Even when I was just another angel. I thought you were too haughty, too -- to paraphrase a friend -- you had an entire oak tree shoved up your ass. But now? I'm looking at you and I... I just pity you. Because you were never God's favorite. You were just a little part of his story, a tiny part of his story. You weren't even a star. At least Lucifer knew that God can't be trusted. But I guess he was always the smart one.||”|
— Castiel to Michael
in Our Father, Who Aren't in Heaven
For the majority of Castiel's early life, Castiel was led to believe that every order given out was from God. In reality, his older brother the Archangel Michael was in charge of Heaven due to God's absence. Before his rebellion, Castiel respected his eldest brother because of his rank and power, though he didn't know him very well. Castiel would later state that even while loyal to Heaven, he never actually liked Michael because of his uptight personality despite not knowing the archangel personally very well.
In 2008, Castiel and his garrison were given the task of raising Dean Winchester from Hell. Castiel was then ordered to watch over Dean and pass on orders to him from Heaven. Castiel did all of this thinking it was God's will.
When Castiel began acting out on his own will, Heaven captured him and re-programmed him into obeying Heaven's orders. It was during this time that Castiel learned that God was absent and everything he knew about Heaven was a lie. Castiel rebelled, and sided with the Winchester brothers against Heaven.
For a majority of Season 5, everything he did following this was in direct confrontation to what Michael wanted. His greatest act of defiance was making sure Dean never said "yes" to Michael.
Castiel met Michael face to face when he arrived at Stull Cemetery to prevent Michael from fighting his brother Lucifer. Castiel insulted his brother and tossed a molotov cocktail made of holy oil at Michael for his manipulations of the angels, causing him great pain and forcing him to vanish from the field. This enraged Lucifer, who responded by smiting the angel.
After Michael and Lucifer were imprisoned and he was resurrected by God, Castiel sought to help un-brainwash his siblings from Michael's false teachings, but the effort was in vain. Furthermore, Raphael intended to free both Michael and Lucifer from the Cage in order to restart The Apocalypse. This led to a second civil war in Heaven, as Castiel tried to prevent this from happening.
When Castiel discovered that Sam's soul was still stuck in the Cage, he is the first and so far the only person to assume that Michael took part in torturing Sam before his soul was retrieved. Once Castiel obliterated Raphael, Michael's chances of escaping The Cage seemed to have faded completely. Years later, a weapon crafted by Michael would be used by Ramiel to attack Castiel. The effects of the lance slowly killed Castiel, until Crowley destroyed the lance and saved Castiel from death.
The brothers met ten years later, Castiel prayed to Michael for them to talk about things. Michael caught onto the prayer and was angry at him for calling him Assbutt, setting him on fire and then helped send Michael to Hell, even worsened by how Castiel dared to say that Michael must help them fight God. As Michael speculates if Castiel has come to beg forgiveness, Castiel surrounds the archangel in a ring of Holy Fire. As the Winchesters enter with the Supernatural Handcuffs, Michael angrily demands to know what Castiel has done. While Michael was detained, Castiel tried to speak with him of their father's betrayal but Michael refused to consider it and Castiel then admitted how he always disliked his eldest brother, which did not at all faze or amuse Michael, who remained calm and cold, but noted now he just pitied him for his continued misguided faith in trying to be the "good and favorite" son, while also berating Michael for not acknowledging he is just a puppet, which finally enraged Michael who then attacked his brother for his words. While no match for Michael's strength, Castiel was nevertheless able to take the opportunity, with Michael focused on gripping his neck determined to hurt him for his words, to show the archangel his memories of God's betrayal such as; God masquerading as Chuck, the fight with the Darkness, the murder of their nephew Jack and the Apocalypse World Michael. With this, Michael became disillusioned with God enough to aid Castiel and the Winchesters.
Castiel and Alternate Michael
While Castiel has made no mention of the original Michael in a long time, he has learned from Lucifer that the Michael from an alternate reality wishes to invade their world and wreak havoc. Though reluctant to believe this, Castiel wanted to share the news with Dean and Sam but Lucifer prevented him.
After their capture by Asmodeus, Castiel still remained skeptical of Michael's invasion until Lucifer compares him to their own Michael stating once he settles on something he does it. He is also made aware that the latter has Mary Winchester and is torturing her before he angrily cuts Lucifer off from telling him more, which clearly caused Castiel to develop a degree of resentment towards Michael.
After escaping Asmodeus and being attacked by Lucifer, Castiel returns to the Winchesters and tells them Michael is coming and Lucifer's fearful warnings confirm it. Castiel also proceeded to aid the brothers in creating a rift to Apocalypse World, in order to save Mary and Jack (who was sent there as well) from Michael.
In Good Intentions, Castiel is worried about Michael's invasion and falls back into his soldier persona by torturing information out of Donatello Redfield. Though he admitted remorse, Castiel told the Winchesters that Michael's arrival means to resort to any means to defeat him.
During Bring 'em Back Alive, Castiel is relieved to hear from Dean that Michael doesn't have Jack anymore.
In Funeralia, Castiel went to Heaven and warned his remaining siblings about this Michael and described him as being much worse than their version.
In Exodus, Castiel was sad to hear from Sam and Dean that Gabriel was killed by this Michael, which likely caused him to resent Michael even more, but he took pleasure in the fact that Michael was trapped due to Gabriel's last actions.
During Let the Good Times Roll, Castiel finally meets the Alternate Michael and was shocked to see him in the main universe. Remembering Gabriel's death, he quickly tries to attack him in rage, despite knowing the power Michael wields but is stopped by Sam from fighting him as Michael provokes him. Castiel instead retreats with the brothers after holding Michael off. They later engage at the bunker, with Castiel attacking Michael who effortlessly knocked out Castiel. Castiel soon awoke to find Michael injured by Jack and was somewhat relieved to see him defeated. Unlike Dean, Castiel was unwilling to let him possess Dean as he, somewhat correctly, believes that Michael would take full control over Dean. Afterwards, Castiel became aware of Dean's fate at being used by the Archangel and was both distraught at his ward's fate, (as well as the destruction he could cause in his true vessel) which will likely increase his resentment towards Michael considerably.
After Michael went about roaming the earth, Castiel searched for him and tried to save Dean in Stranger in a Strange Land. He later wondered on how to defeat him, though was not keen on killing Dean in the process like Jack was in Gods and Monsters.
Castiel was relieved to see Dean released from his possession in The Scar. However, he was worried when seeing Dean's memories of Michael possessing him.
During The Spear, Castiel joins his friends on where to find Michael and defeat him after learning of his plans to unleash his army on a city. He is disgusted at the latter's intent and wishes to stop him, joining Dean on locating the spear of Alternate Kaia. At Michael's headquarters, Castiel is detected and confronted by him. Castiel attempts to attack him though he effortlessly overcomes his attacks before savagely beating him. The Archangel drags the wounded angel to his office where Castiel watches as Dean attacks him while armed with the Spear. Castiel is relieved that it might finally end, when Dean overpowers him but behaves strangely by breaking the spear and Michael's vessel falls dead. Castiel is speechless when its revealed Michael has possessed Dean once more, having left a way to enter without consent. Castiel asked why he waited so long to take back control and is disgusted by Michael's desire to break Dean's spirit and locking him away to prevent his interference. Michael taunts Castiel and the rest of Team Free Will by telling them, nothing stands in his way now and his monsters are on the prowl awaiting his signal, which he soon gives with a snap of his fingers.
In Nihilism, Castiel was angry at Michael's taunts and tried to attack but Michael caught him and told him not to interrupt before Sam helped him cuff the archangel. After they were brought to the bunker, Castiel spoke with the Alternate Michael who expressed his bitterness in at how both his and the main God abandoned their creations. Castiel visibly disapproved of this mindset and by Michael's callous desire to kill God as well as end the world on a whim. He confronted Michael in Dean's mind and fought him but was overpowered, though helped in locking him away to prevent his evil from spreading.
During Ouroboros, Castiel learns Michael took control of Rowena MacLeod as an alternative vessel. Castiel tried to attack him but Michael stunned him and proceeded to torture him as revenge for trapping him. Michael would have killed him had Jack not taken a stance against him and eject him from Rowena. Castiel witnessed Jack destroy Michael and was amazed that the latter was finally dead as well that Jack regained his powers.
Castiel and Naomi
Castiel was rescued from Purgatory by her and the angels. At first, he didn't know who she was until she reveals her name before sending him back to Earth.
For most of Season 8, Naomi had Castiel under her control which she declared as fixing him, due to his rebellion. Castiel was forced to obey her commands while having no free will of his own though he was able to have her spare Meg . However, after she ordered him to kill Dean to get the Angel tablet, Dean got through to him and the tablet's powers severed her control. Now free of her, Castiel took the tablet as Naomi and her squad of angels searched for him. Afterwards, she lured him to her by killing innocent humans and revealing she had tampered with his memories before and made him do terrible things, which furthered sickened him. Castiel was saved from her by Crowley. When Naomi learned that Castiel has teamed up with Metatron. She tried to warn Castiel of the scribe's plans even voicing she was wrong in her old ways, telling Castiel and Dean that angels were meant to protect God's creation and somewhere they lost sight of their purpose. She promises Castiel that if he truly wishes to return to Heaven, she will hear him out. Though Castiel turned his sister away, he was skeptical of her claims but after hearing it can't be possible, he thought Naomi was lying again. However, Metatron later captures him and he sees Naomi's body, he is horrified as Metatron confirmed to Castiel that she was telling the truth.
In later seasons, Castiel would make mentions of Naomi mostly recalling her manipulations of him, he would often be angry at her actions.
In Funeralia, they meet again and he is surprised but angered to see her alive as he questions her survival. Naomi explained she faked her death and reveals she spent some years healing from Metatron's damage. Castiel then bluntly states his previous relief after he believed her dead, causing Naomi to comment that they never did see eye to eye. Castiel then angrily confronted Naomi over her actions on him such as stealing his memories, threatening to tear him apart, making him repeatedly act out Dean's murder and killing many, many people in front of him. Naomi casually states that "those were simpler times" and gets him on the topic of restoring Heaven which she reveals is losing power. The situation Heaven is in and Naomi's changed personality causes Castiel to set aside their differences and form an alliance with Naomi. When Naomi departs after accompanying Castiel back to Earth, he promises to restore Heaven with Gabriel's help and goes so far as to share a nod with his sister.
In Byzantium, Castiel meets her again when The Shadow invades Heaven to claim the recently deceased Jack and bring him to The Empty. Castiel was resistant of her plan to hand Jack over to save Heaven but when the threat takes over her, Naomi implores him to run. After Castiel bargains with the Shadow, Naomi thanks him and offers him a reward by telling him of where to locate Michael. This likely caused him to feel grateful to her for helping him.
During The Spear, Castiel acknowledges that Naomi is complicated, but he does believe her that she will do her best to protect the souls of Heaven.
After learning that Naomi has been overthrown by Duma in Jack in the Box and locked up, Castiel is actually upset, to Duma's surprise as she is aware of the history between the two. Though Castiel was mainly concerned with getting Naomi's help to find Jack, he did seem worried about her. After Duma threatens the souls of John and Mary Winchester, Castiel kills Duma, potentially allowing Naomi to regain control of Heaven once again.
Castiel and RaphaelEver since Raphael killed Castiel in Lucifer Rising, the two have been enemies. Before Castiel rebelled, it is believed Castiel probably respected Raphael, due to rank and power. After being killed and resurrected, Castiel seeks out Raphael in order to question him on God's whereabouts. Dean assist him on this task and when they track him, Castiel traps Raphael demanding answers but gets none. He then leaves as his brother tries to threaten him but Castiel only responds with a taunt which gets praise from Dean.
Their hatred for one another escalates when Raphael decides to restart the Apocalypse following its collapse, which Castiel refuses to let happen. Through a deal with Crowley, he starts a civil war in Heaven. The battle ends in Castiel's favor after he manages to trick Raphael and absorb the souls of Purgatory for himself.
With Castiel now more powerful than him, Raphael pleas to Castiel by calling him his family and ask if he'd really align with Crowley than sparing his own brother. Castiel ignores Raphael's pleas by smiling at his fear and kills Raphael in a similar manner he himself was killed two years prior, obtaining his revenge.
Castiel and Rowena
Castiel formally met Rowena when Sam gathered the two of them - plus Charlie - to take part in a secret task of freeing Dean from the Mark of Cain. Both Castiel and Rowena showed dislike in each other almost instantly and Castiel was pleased at the idea that they would kill her when it was over. He was essentially guarding Rowena while watching over Charlie. At Charlie's request, Castiel eventually relocated Rowena to a separate room, only to realize Charlie had fled during that time. Charlie subsequently died after getting cornered by a Styne, but the task continued thanks to Charlie's notes.
Rowena completed it by performing the spell that removed the Mark from Dean. With no obligations left, Rowena cast the Attack Dog Spell on Castiel, forcing him to viciously attack, and attempt to kill Crowley. After he had seemingly completed this task, side-effects of the spell still sent Castiel into fits of blood-thirsty rage, leading him to kill several people. It wasn't until Sam threatened to kill Rowena was Castiel finally freed from the spell.
Later on, Rowena formed an alliance with Lucifer, intent on helping the archangel escape his prison. This led Castiel into confrontation with his older brother, and in a fit of despair, he consented to possession. The payback was Rowena's own, brief demise.
From then on, Castiel and Rowena only interacted when called upon by Sam and Dean to help them deal with a problem. Their next alliance was assisting God in his plan to re-imprison the Darkness. Another alliance was formed in an effort to lock up Lucifer, to whom Rowena no longer held any loyalties, and whose freedom Castiel blamed on himself.
They later allied together to rescue Jack and Mary Winchester from Apocalypse World and were successful. When Castiel returned to find Rowena still holding the rift open, he appeared to be shocked but pleased to see her while she told him that "its about bloody time!".
During Season 14, Castiel turns to Rowena for a resource at times along with the Winchesters. In The Scar, Castiel goes so far as to call Rowena for magic help to save Laura when his own powers proved to be insufficient. In turn, Rowena pointed Castiel to a book that contained the spell she thought that he would need.
When Rowena dies, Castiel shows genuine sadness and horror at her selfless sacrifice, worsened by how he had a part in it by killing Belphegor and destroying Lilith's Crook before it could finish. While he believed he did the right thing, he acknowledged his responsibility in Rowena's death and did not object on that when Dean snapped on him, only trying to make him see he believed he did the right thing.
After discovering that Rowena is the new Queen of Hell, Castiel, like the Winchesters, is surprised but pleased by her new role.
Castiel and Uriel
They worked together during the breaking of the 66 seals. They were from the same garrison. Castiel, for the most part, was Uriel's superior, and stopped Uriel from hurting Sam and Dean many times. Uriel was essentially Castiel's opposite, as he had a strong dislike of human beings, calling them "mud monkeys". Castiel often had to keep his brother in line.
When Castiel was demoted, Uriel took charge of him. However, Uriel went rogue and tried to convert Castiel to his own plan of helping Lucifer destroy mankind. Castiel refused, while disgusted Uriel killed several of their siblings and the two angels engaged in a bitter fight to the death. Just when it looked like Castiel was about to be defeated and killed, former angel captain Anna Milton came up and stabbed Uriel, killing him and saving Castiel's life.
- Bobby and Castiel - Castiel and Bobby's Relationship over the years.
- Meg and Castiel - Castiel and Meg's Relationship over the years.
- Castiel and Sam - Castiel and Sam's Relationship over the years.
- Dean and Castiel - Castiel and Dean's Relationship over the years.
- Castiel and Crowley - Castiel and Crowley's Relationship over the years.
- Castiel and Jack- Castiel and Jack's relationship.
- Most of Castiel's relationships listed here revolve around betrayal, either Castiel betraying the other (Anna Milton, Balthazar, Bartholomew, Crowley) or the other betraying Castiel (God, Ishim, Metatron, Uriel).