Supernatural - Season 6 Episode 16
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6x16 | ...And Then There Were None
March 5,2011, 03:00AMEve, the Mother of All, unleashes a new monster upon the world: a black worm-slug that can enter the brain and force people to kill. Sam and Dean join forces with Bobby and Rufus and track it to a cannery, only to discover that Gwen and Samuel are also there looking for the monster... and none of them know who the monster is inside.