S4·E21 When the Levee Breaks
Aired May 7, 2009
Synopsis
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.
Episode recap
In this episode of Supernatural, Dean and Bobby have something locked in Bobby's panic room. This entity is a result of Sam being corrupted by demon blood. As the apocalypse draws near, Bobby wants to free Sam to fight on their side.
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