Watch Supernatural Season 4 Episode 21 S04E21 Online Preview

Watch Supernatural Season 4 Episode 21 S04E21 online promo preview.

Supernatural new episode 4.20 this week titled When The Levee Breaks.

When The Levee Breaks summary:

Sam is locked in Bobby's panic room to cleanse his body from demon blood. However, after several seals are broken Bobby wants to set Sam free to help stop the Apocalypse and Dean seeks out Castiel for help.

Directed by George Neuman.

Supernatural Season 4 Episode 21 (s04e21) airs Thursday night May 7, 2009 at 9:00 p.m. in CW tv channel and can be watch online stream here.

Watch previous episode 21 "The Rapture" here.

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