A man from Lex’s past stalks him in conjunction with a mysterious death at Club Zero that Lex may have been responsible for. Meanwhile Chloe looks into Clark’s past as…

Sam continues to try to save Dean from the Mark of Cain. Realizing that Dean’s antics are causing problems for him in hell, Crowley seeks help from a reluctant Castiel.

Dean is a demon and running amuck with Crowley while Sam tries to figure out what happened to his brother. Meanwhile, Castiel is dealing with his diminishing grace.