'Supernatural' Recap: Who Is Sister Jo and Who Makes a Sho0cking Return?

Supernatural, like politics, makes strange bedfellows. We've seen the Winchesters working with their biggest enemies many times. In this week's episode, "Devil's Bargain," we get a few unlikely alliances, a fascinating new character played by Jensen Ackles' real-life wife and a truly shocking and exciting return.