SUPERNATURAL, SEASON 5, EPISODE 20, “The Devil You Know”

Crowley offers to help the brothers hunt down Pestilence and reclaim his ring, while Dean gets a lesson in trust when Sam's history with the Four Horsemen's demon `Stable Boy' is revealed. The boy is revealed to be Brady, the one that killed Jessica/Jess, and the one that introduced Sam to Jess in the first place. Brady wasn’t the guy that Sam thought he was, Brady was possessed by a demon. Brady is currently strapped to a chair at the makeshift house that Crowley has been staying in since demons burned down his own house. Dean and Crowley want Sam away from Brady, but, Sam won’t let that happen.