Last weeks episode of Supernatural dove deep into the shows mythology to answer all sorts of questions we had been pondering for years. The biggest shocker was the reveal that Mary came from a family of hunters, and that she basically sold Sam to the Yellow-Eyed Demon to bring John back to life. Dean also learned that the YED has bigger plans for Sam than making him the leader of a demon army. Castiel wants Dean to stop his brother from going to the dark side, otherwise the angel will take care of the younger Winchester himself.
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