Watch the new episoe of Supernatural Season 4 Episode 21 which entitle "When the Levee Breaks" airs Thursday May 7 at 9/8c on The CW.
Supernatural Season 4 Episode 21 Summary:
Dean and Bobby lock Sam in Bobby’s panic room so he can detox from the demon blood. However, as Bobby sees more seals are being broken he tells Dean they should let Sam out to help them fight the impending apocalypse. Dean disagrees and goes to Castiel for help. Sam and Dean have a big blowout confrontation.Read more and watch Supernatural Season 4 Episode 21 now.
