Supernatural Season 6 Behind-the-Scenes with Misha Collins The actor that portrays 'Castiel' on the show, answers questions about the upcoming premiere of season 6 of Supernatural. Brian B. — September 18, 2010 in TV News Facebook Twitter Reddit Email Comment Actor Misha Collins, who plays "Castiel" on The CW's Supernatural, answers questions about the upcoming season 6 premiere and beyond. Take a look below as the actor takes you behind-the-scenes of what to expect this upcoming season. Topics: Supernatural Brian B.