Season 6 Episode 21 episode 21

Supernatural Season 6 Episode 21 "Let It Bleed" Sneak Peek

Supernatural Season 6 Episode 21 "Let It Bleed" Sneak Peek

Sam is on the run and can't remember who he is in this sneak peek for Friday's two-part season finale. Is this a flashback to when Sam first got out of Hell or is it the result of his wall coming down?