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Supernatural Season 2 Episode 9 - Croatoan
After Sam has a premonition of Dean killing a defenseless man, the brothers head to Rivergrove, Oregon to investigate. There, Sam notices “CROATOAN” carved into a pole, reminding him of the missing colony of Roanoke. They soon find that all forms of communication have been shut down, and extremely violent townspeople are blocking the roads out. They go to a local doctor’s office, where a doctor finds that the blood of the violent people has been infected by a virus containing sulfur, leading Sam to believe his father’s theory of Croatoan being a demonic plague. A woman in the office suddenly turns violent and attacks Sam. She infects him with her blood before Dean is able to kill her. Sam tries to kill himself, but Dean stops him. Moments later, it is learned that all of the infected people have suddenly vanished, leaving the town deserted. Sam has his blood tested, and finds out that he was not infected. After the brothers leave town, one of the survivors is revealed to be a demon; it contacts someone to inform him that Sam is immune to the virus.
Air Date: 7 Dec 2006