Castiel is back on the episode "The Third Man." Check out this clip from the 10/8/10 episode of the show.
Check out the official promo for The Third Man. On the episode, Sam and Dean call on Castiel for assistance as they investigate a case about several dead police officers.

Supernatural Season 6 Episode 3 Quotes

Now I lay me down to sleep, I pray to Castiel to get his feathery ass down here.


Dean and I do share a more profound bound. I wasn't going to mention it.