I'm the one who gripped you tight and raised you from Perdition.

Castiel first appeared on our screens in the first episode of Season 4, Lazarus Rising. Castiel is an angel, a servant of heaven. Many angels laid siege to Hell to rescue Dean,
but it was Castiel who ultimately pulled Dean out of the pit. According to
Castiel, he did so "because God commanded it". His hand print was burned
into Dean's left shoulder.
All angels must take on a 'vessel' to manifest on earth, and Castiel has taken Jimmy Novak, as his vessel. Castiel and a group of other angels arrive on earth with the knowledge that a demon army are attempting to break the 66 Seals. Each Seal is said to be a kind of lock to the door of Lucifer's Cage. If 66 seals are broken, Lucifer walks free, and will set about bringing the Apocalypse with him.
Over time, Castiel develops an empathy for the Winchesters, in particular Dean. Castiel begins to question his beliefs and goes against Heaven, ultimately taking the side of humanity.
After Sam sacrifices himself to defeat Lucifer, Castiel set about to rescue Sam from the Cage, but returned without his soul. In an attempt to stop Archangel Raphael from restarting the Apocalypse, Castiel is tempted into an agreement/partnership with the demon, Crowley - a deal that they will both find a way to releasing the souls of Purgatory. This results in Castiel becoming very distanced from the Winchesters, as he hides his secret partnership.

After he takes in the souls of Purgatory alone, Castiel kills Raphael and demands that Crowley leave. But not before declaring to the Winchesters and Bobby that he is now 'the new God', and that they should bow before him. Taking in the souls and creatures from Purgatory, Cas becomes aware that he has taken in one of God's first creations - monsters called Leviathans. Castiel sets out to smite all those hypocritical and evil people who do wrong in God's name, not realising he is under the influence of the Leviathans. The power becomes too much, and Cas tries to return the souls to Purgatory in an attempt to redeem himself and apologise to the Winchesters.
The Leviathans had other plans.
They cling on inside the vessel, and take over. As Castiel deteriorates, the Leviathans march the vessel into a reservoir and drown the former angel. His trademark trenchcoat washes up on shore, and Dean takes it with him.
Although Castiel hasn't appeared in Supernatural for the last 10 episodes, there is news that he will return from 'death' in coming weeks. Incase you have let yourself and every Supernatural lover down, catch up with a few facts about Cas.

On one occasion, Castiel describes his true angelic form as a "multidimensional wavelength of celestial intent". On another, he says that is true form the size of the Chrysler Building in New York, which is 1047 feet (319 m) in height.
Looking on Castiel's true form will burn out a human's eyes, as Pamela Barnes found when she tried to summon him in a seance.
Castiel is able to teleport himself, and occasionally others, through space and even time. One occurence of this is when he sends Dean back to 1973 to try and save his mother, Mary Winchester, before she cements her demon deal - the deal which ultimately leads to her death.
Our Angelic friend possess a high knowledge of lore and occult objects, including Enochian symbols and even the structure and defense systems of Hell. However, he does come up short in the department of human emotions, customs and behaviours.
Castiel was cut off from Heaven when he helped Dean escape from a fiery angel named Zacariah, meaning he lost a few powers and thus, became unable to heal an injured Bobby. After banishing himself and other angels via the use of an Enochian symbol, Castiel appears virtually mortal by the end of Season 5.
Castiel has been killed twice. Firstly by Raphael and secondly by Lucifer. Both times Castiel was ressurected. He thinks God brought him back, 'new and improved'.
Castiel is said to have existed before Humanity was even a thought. He is, as of 2011, presumed dead.

Looking on Castiel's true form will burn out a human's eyes, as Pamela Barnes found when she tried to summon him in a seance.
Castiel is able to teleport himself, and occasionally others, through space and even time. One occurence of this is when he sends Dean back to 1973 to try and save his mother, Mary Winchester, before she cements her demon deal - the deal which ultimately leads to her death.
Our Angelic friend possess a high knowledge of lore and occult objects, including Enochian symbols and even the structure and defense systems of Hell. However, he does come up short in the department of human emotions, customs and behaviours.
Castiel was cut off from Heaven when he helped Dean escape from a fiery angel named Zacariah, meaning he lost a few powers and thus, became unable to heal an injured Bobby. After banishing himself and other angels via the use of an Enochian symbol, Castiel appears virtually mortal by the end of Season 5.
Castiel has been killed twice. Firstly by Raphael and secondly by Lucifer. Both times Castiel was ressurected. He thinks God brought him back, 'new and improved'.
Castiel is said to have existed before Humanity was even a thought. He is, as of 2011, presumed dead.

