21. When the Levee Breaks (2009)
Dean and Bobby have something frightening locked in Bobby's panic room: Sam, who is corrupted by demon blood. With the apocalypse drawing nearer, Bobby wants to free Sam to fight on their side.
Release date: 2009-05-07
User rating:
8.2 / 10
27 votes
Season number: 4
Episode number: 21
Runtime: 43 minutes
Director: Robert Singer
Writer: Sera Gamble
