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Many angels laid siege to [[Hell]] to rescue [[Dean]], but it was Castiel who ultimately pulled Dean out. According to Castiel, he did so "because God commanded it". His hand print was burned into Dean's left shoulder.
Castiel is amongst a group of angels who manifest on Earth to stop the breaking of the [[66 Seals]] which will release Lucifer and start the Apocalypse. Over time he develops an empathy for the Winchesters, in particular Dean. When he learns that [[
Micahel]] actually intends for Lucifer to be released so he can kill him, Castiel tries to wanr Dean, but is punished. Ultimately he breaks allegiance with Heaven to side with humanity.
With Lucifer free, and Castiel cut off from Heaven's power, he decides to try and find the long absent God. When he learns God is not interested in intervening to stop the Apocalypse, he is devestated. He works to support the efforts of Sam, Dean and Bobby in stoppping the battle between Michael and Lucifer.