Castiel (Misha Collins) will first appear in the season in the Season 5 Premiere episode "Sympathy for the Devil" which airs Thursday September 10 at at 9pm on the CW. We had an opportunity to interview Misha Collins during Comic Con 2009 and he revealed a few juicy things about this upcoming Supernatural season 5, notably about his status with heaven.
Synopsis: Season 5 Episode 1 "Sympathy for the Devil" - Picking up where the finale left off, Dean (Jensen Ackles) and Sam (Jared Padalecki) watch as the Devil (guest star Mark Pellegrino, Lost) emerges from Hell. The brothers and Bobby (Jim Beaver) deal with the aftermath of Lucifer rising and the stunning news from Chuck the Prophet (guest star Rob Benedict) that Castiel (Misha Collins) was blown to bits by the archangels. Robert Singer directed the episode written by Eric Kripke.