4x21 When the Levee Breaks
First Aired: May. 07, 2009 on The CW
Summary: Sam is plagued by horrendous nightmares and visions from his past as Bobby and Dean force him to go cold turkey to break his addiction to demon blood. Meanwhile, Castiel makes Dean a deal, and the demons break all but the last few Seals.
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Guest Stars[no credits found]