The CW has shared a clip from the next episode of "Supernatural". Dean and Sam go to a damaged building and find Castiel lying among the debris. Upon waking up, Castiel said that he is a mortal named Jimmy and that the angel has gone.
In the episode called "The Rapture", Castiel appears to Dean in a dream and says he has something important to tell him but they need to meet somewhere private. Dean and Sam go searching for Castiel but instead find Jimmy, Castiel's human vessel, who has only a spotty recollection of being an angel. Jimmy wants to return to his family and normal life, but Dean and Sam are concerned about his safety.
Words are, Castiel is called back to Heaven, leaving the body back to the owner. "The Rapture" airs Thursday, April 30.