Lucifer

Lucifer is the name of the supposed penultimate evil to be faced by Dean Winchester, his brother Sam Winchester, and all Hunters at large. He is the ruler of the domain of Hell as well as the chief enemy of God and his Angels. The entire fourth season of the series chronicles the efforts of Lucifer's associates to break the 66 Seals and release Lucifer himself from his long imprisonment to wreak havoc on the world and once more challenge God. By the end of the fourth season, the final Seal, the death of the first Demon that Lucifer created after his falling out with God, Lilith, is broken by Sam Winchester (unaware at the time that this would in fact break the final Seal rather than prevent it from being broken), allowing Lucifer to finally return to his full strength once again and escape into the world.

It was announced on June 26, 2009 that Mark Pellegrino will be portraying Lucifer in Season 5.

Origins
Lucifer was once one of God’s greatest Archangels, and as he was the brightest angel of all, he came to be known by such names as the Morning Star and the Light-Bearer. It was said that he once had a loving relationship with God and was fiercely loyal to Him. However, when God created mankind and asked His angels to honor them by bowing to them (as they were His greatest creation), Lucifer refused to do so believing that he should not have to bow to a lesser creature than God. Eventually Lucifer’s arrogance got the better of him, and his mind became warped into believing that he could outshine God Himself, as his faith in God had been shaken by God’s request that he bow down to the race of humans.

Deluded that he could be greater than his own Creator, Lucifer staged a rebellion and attempted a coup of the realm of Heaven to overthrow God and take His place as the ruler of the universe. It is said that about a third of the Heavenly Host joined Lucifer and rallied to his cause, laying siege to Heaven and attempting to overthrow their Father. However, Lucifer and his followers discovered, to their cost, that God was not to be overthrown or blasphemed, and He easily defeated Lucifer and his minions.

When Lucifer refused to ask for forgiveness and reconcile with God, it was decided that he and his followers would pay a price for their rebellion: to be banished from the realm of Heaven henceforth and to be cast into a pit of molten fire, the realm of pain and suffering known as Hell. As Lucifer and his fellow rebel-angels were thrown from Heaven and into this pit, the fire wreaked a horrible toll, burning and disfiguring them from their angelic forms to take on new grotesque appearances. Lucifer abandoned his former identity and became the ultimate antithesis to God Himself out of hatred for what he felt God had done to him, taking on the name Satan or more commonly known as the Devil, with the other exiled angels that had joined him becoming his demons. He then took over the realm where they had fallen, Hell, becoming its ruler and resolving himself to oppose God at every turn and work to make life on Earth miserable for the human race in retaliation for his failed relationship with God. As a sign of ill intent and blasphemy, Lucifer himself created the first of what would become many new demons born of him: Lilith, from whom many new demons would originate as well.

To make sure Lucifer could not cause total chaos and destruction for the human race or the realm of Heaven, a series of powerful Seals were created to bind Lucifer in Hell so that he could not venture out of Hell uninhibited. The Seals served to bind Lucifer’s power and to keep him from escaping his new prison of Hell unchecked. It would only take 66 of these Seals to be broken, however, for Lucifer to once more be able to venture forth from Hell at his full power and strength. As long as the 66 Seals remained intact, Lucifer would be bound in Hell for eternity and be unable to initiate another war against God and His creations.

The Coming of Azazel
During his long imprisonment within the confines of Hell, Lucifer was served by his many demons, one of the most prominent being his son, the Yellow-Eyed Demon, Azazel. None of them had truly seen Lucifer in ages, as he was locked away in a special part of Hell that had only one entrance, which was kept locked by the 66 Seals. This left the vast majority of demons without hope that they would ever find Lucifer and return him to power, save for one demon in particular: Azazel himself. Azazel, who was not bound by the limiting effects of the 66 Seals and thus could retain his power and full strength outside of Hell, eventually escaped to Earth in search of a way to free Lucifer from Hell. In 1972, after escaping from Hell and traveling the world for years in search of the entrance to Lucifer's cage, Azazel discovered the location of Lucifer's prison to be in one of the most ironic of places: in a convent. He possessed the body of the chief priest of a prominent church, St. Mary’s Convent in Ilchester, Maryland (the place where Lucifer could be released), and pretended to carry out the priest’s current mass, with an audience of eight nuns in attendance. Eventually, the priest’s words began to speak of a different father, Lucifer, and the priest was then revealed to be Azazel, who then proceeded to slaughter the nuns, who screamed in terror as they were horrifically disemboweled.

After they were dead and the church was left a bloody mess, Azazel (still possessing the priest’s body) spoke directly to Lucifer himself (who spoke through the body of a nun), calling him his “father” and Lucifer in turn calling Azazel his “son”, and Azazel stated his great relief to hear Lucifer's voice once again after so many ages. Lucifer commended Azazel's unshakeable faith in him and stated that he had done well to find him. Azazel then requested knowledge of what was binding Lucifer in Hell and how he could help Lucifer break free and rise once more. Lucifer revealed that the final Seal that was keeping him within the confines of Hell is the death of Lilith, one of the first demons he crafted after his fall from Heaven and transformation into his present state. Revealing that Lilith would have to be freed from Hell and then sacrificed by a special child with psychic powers strong enough to perform the deed, Lucifer entreated Azazel to devise a way to break this Seal and set him free. It is here that Azazel is revealed to be ultimately loyal to Lucifer and that his endgame all along throughout the series has been the release of Lucifer from Hell, though his plan was kept well hidden enough by the release of a demon army many years later that even the angels of Heaven were left guessing what his ultimate goal had been after his death. With Lucifer's location now confirmed and now knowing what he had to do in order to release him, Azazel departed his meeting with his father with great hope and an evil plan in mind to fulfill Lucifer's release from Hell.

The Release of Lilith
Armed with knowledge of the 66 Seals and the final Seal of them all, Azazel crafted a plan to break the final Seal by finding the prophecized special child that would be strong enough to kill Lilith when the time came. He also devised a plot to break Lilith out of Hell so the deed could be performed when the time was right. In search of the special child spoken of by Lucifer himself, Azazel began to search far and wide for parents sure to bear children with certain psychic abilities if properly activated. To this end, Azazel would typically blackmail the parents of the child in question by means of quid pro quo into allowing him to visit the child in question upon the night of their six-month birthday (as he was unable to enter without their permission). What Azazel did not reveal to the parents however was that he would bleed into the mouth of the child in question, feeding them demon blood and activating their psychic powers within. He did this with many children, knowing that one day he would have to determine which would be powerful enough in the end to kill Lilith and fulfill the release of Lucifer from Hell. Under the guise of searching for the leader of a demon army he would release from Hell as a secret cover for his true goal, Azazel covered his tracks well so as to not be discovered by the angels of Heaven and have his plan exposed. Azazel also finally learned of a way to release Lilith from Hell, by means of a portal connecting the Earth to the realm of Hell called the Devil’s Gate. After discovering the Devil’s Gate to be protected by numerous protections set in place by the legendary Samuel Colt and that the key to the gate itself was a gun created by Colt himself, Azazel began to also search for this key and found another use for the special child he sought: to pass through the barriers Samuel Colt had set in place around the Gate and open the Gate itself once the key had been located.

This plan came to fruition many years later, beginning in 2007 after Azazel pitted many of the now grown-up special children against one another in a battle to the death to see which would ultimately prove strongest, as a means to see which would be best suited to perform the task of killing Lilith. After Jake Talley came out on top after stabbing Sam Winchester in the back, Azazel entrusted the Colt (acquired from John Winchester) to Jake and instructed him to use it to open a crypt in an old cowboy graveyard in Wyoming (in truth the Devil’s Gate itself). Although Sam was resurrected by means of a bargain his brother Dean Winchester made with the Crossroads Demon and he and his allies headed Jake off at the graveyard, Jake was able to insert the Colt into the lock on the crypt and turn it like a key, causing the lock to begin to come open before he was shot mercilessly by Sam. With this, the Devil’s Gate was blasted open, releasing a demon army into the world to serve as a distraction while Lilith was also secretly released from Hell through the Gate as well through Azazel’s cunning. Although Azazel was killed by Dean using the Colt, Azazel’s plan was now set into motion and his plan remained shrouded in mystery to even the highest authority of Heaven. With Lilith now released from Hell and one special child remaining, tested and tried, the elements were now set in place for the final Seal binding Lucifer to be broken when the time was right. It would now take only a guiding hand to nurture the special child, Sam Winchester, to fulfill the task to which Azazel had truly planned for him: the killing of Lilith.

The Breaking of the 66 Seals
After Dean Winchester is dragged into the pit of Hell by Lilith’s Hell Hounds at the end of the third season of the series (in fulfillment of his bargain with the Crossroads Demon to revive Sam in exchange for his soul), he is kept there in pain and suffering for the equivalent of forty years in Hell (four months on Earth). For the first thirty of those forty years, the demon Alastair tortured Dean daily and offered to let Dean off of his torture if he himself would torture other souls trapped in the pit, and each day Dean refused the offer. However, after 30 years of pain and misery, Dean began to crack and finally could take no more. And so he agreed to Alastair’s offer, getting out of his own torture and taking up devices to torture other souls for a total of ten years. Little did Dean know however that this was the first Seal that bound Lucifer in Hell, and that as long as the true first seal remained intact, the others could not be initiated for breaking. This had been Lilith’s and Alastair’s plan all along: to force Dean (as a righteous man) to crack under torture and begin torturing other souls to spare himself from further torment. From the moment Dean first began torturing souls under Alastair’s tutelage, the first Seal binding Lucifer was at last broken, enabling Lilith and the vast multitude of demons now on Earth to begin breaking others in order to release their leader, Lucifer, from his prison in Hell.

The fourth season of the series chronicles the efforts of Lucifer’s associates to break the other Seals. The Seals operated as locks on a door: each had a single key that could open that particular Seal and weaken the door on Lucifer's prison. Some examples of these included the “Rising of the Witnesses,” the summoning of Samhain, the sacrifice of two Reapers under the Solstice, the murder of seven angels by one of their own, etc. Although there were more than six hundred Seals in place, no more than sixty-six were required to be broken in order for Lucifer to escape his prison. There was also a stipulation in the initiating and ending of the process of breaking the Seals: the first Seal and the final Seal had to both be satisfied regardless of what other Seals were broken. The first Seal, which had to be satisfied before the others could then be broken, was the cracking of a righteous man in Hell. Dean Winchester breaks this Seal unknowingly during his imprisonment in Hell, and he is rescued soon after, before he is recruited, along with his brother, to fight against Lilith's forces to save the other Seals from being broken. As it was nearly impossible to know which Seals Lilith would choose to target, it was also nearly equally as impossible to stop her from breaking others. Sam Winchester is also slowly but surely turned into a demon-blood addict by Ruby, as she prepares him to fulfill his own secret role in Lucifer's release: carrying out the execution of Lilith. Finally, near the end of the fourth season, only the true final Seal remains: the death of Lilith herself, the first demon Lucifer created ages before to spite God. Lilith had planned out the breaking of the Seals, and once sixty-five of them were broken, she prepared to play her own personal role in Lucifer's release, to die in order to ensure the release of her creator and the coming of the Apocalypse.

The Rising of Lucifer
By this point, Dean has been rescued from Hell by the Angels, who had hoped to rescue Dean before he gave in to his torture in order to prevent the first Seal from being broken, and Sam has greatly honed his demonic powers with the help of a demon named Ruby, who has been preparing Sam to be able to battle and kill Lilith under the assumption that this will prevent the final Seal from being broken and as an act of revenge for Lilith sending Dean to Hell in the first place. What Ruby does not confide to Sam or his ever-suspicious brother however is that the truth is just the opposite: Lilith must die as her death is the final Seal necessary to be broken in order to fully release Lucifer, something Lilith herself already knew and was willing to undertake. By the time Dean realizes this truth and escapes confinement by the angels (who wish to confront the demons and Lucifer in the Apocalypse so as to ultimately defeat them and bring about Heaven on Earth), he is too late to warn Sam that killing Lilith will in fact ensure Lucifer’s release rather than prevent it after learning that Sam has gone to the now abandoned St. Mary's Convent in Ilchester, Maryland to confront Lilith. Sam is torn for a moment between listening to Dean's cries and Ruby's screams for him to kill Lilith, but when Lilith mocks him, that overrides all else. Sam kills Lilith, and Ruby then goads him for having in fact enacted the Apocalypse rather than having stopped it, revealing she had been working with Lilith the entire time and that Lucifer himself had foretold that only Sam could kill Lilith and thus ensure his release from Hell. Dean arrives at this point and kills Ruby with her own demon-killing knife, but the Winchester brothers are now faced with the release of Lucifer himself, who escapes to wreak havoc on the world they fight to protect.

Known Servants

 * Alastair (Dead)
 * Ruby (Dead)
 * Azazel (Dead)
 * Lilith (Dead)
 * Uriel (Dead)
 * The Demons of Hell

Family
Azazel (Biological son)

God (Father)

Demons (Children)

Powers
Lucifer has yet to display any superpowers, as he has not yet appeared in the series. However, in a Season 5 teaser trailer called "The Sound Of Hell", Zachariah states "Lucifer is powerful in ways that defy description", heavily suggesting that Lucifer is virtually omnipotent (highly likely as he is the antithesis to the Creator, and is the "god" of demons). Considering that Lucifer is the greatest of angels, he is likely to possess their immortality and invulnerability, probably to a higher degree than even they.

Immortality 

Invulnerability 

Godlike Strength 

Godlike Endurance and stamina 

Shape shifting (serpent)

Omnipresent (satan is everywhere)

Virtually Omnipotent (highly likely as he is the anthesis to the Creator, and is the "god" of demons).

Trivia

 * It is implied (though not confirmed) that Lucifer is the true father of Azazel due to the numerous times Azazel refers to Lucifer by such names as "Father," "Daddy," "Padre," etc in Lucifer Rising, as well as Lucifer's referral to Azazel with the word "son."