The TV series Supernatural Season 4 Episode 21 latest episode is named Greater good.Watch Supernatural Season 4 Episode 21 Online on The CW on May 8,2009 or online.Don't miss your chance to watch it, you can read the overview below about Supernatural Season 4 Episode 21 latest episode.
Supernatural Season 4 Episode 21: When The Levee Breaks
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.
