The Leviathans might be the greatest villains in the history of Supernatural. Sure, the Winchesters have faced Azazel and Lucifer himself, but these are some sneaky monsters who dont play by the usual rules. Not only did they kill Castiel, but this week they seize power, infect anyone they want and prove to be indestructible. If thats not enough, they also destroy the one place that has been around since season 1: Bobbys house.
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