The leviathans destroy Castiel's body and break loose. Now Sam, Dean, and Bobby have to track them all down. Meanwhile, Sam is beginning to struggle with what is real and what is a hallucination.
Stars: Jared Padalecki, Jensen Ackles, Misha Collins
Director(s): Guy Norman Bee
Writer(s): Eric Kripke, Ben Edlund, Robbie Thompson