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Supernatural S04E21

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Supernatural : When the Levee Breaks

S04, E21 ()

Bobby and Dean trap Sam in a panic room so he can detox from demon blood; Dean and Sam have a major confrontation.

TV-14  (L, V)

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Previous Episode

The Rapture

S04, E20 (First Aired: April 30, 2009)

Sam and Dean search for Castiel (guest star Misha Collins), but instead find his human vessel, Jimmy.

Next Episode

Lucifer Rising

S04, E22 (First Aired: May 14, 2009)

Sam and Ruby try to kill Lilith; Zachariah and Castiel tell Dean he must play his part in stopping Lucifer.