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Watch Supernatural Season 4 Episode 16 online via TV Fanatic with over 5 options to watch the Supernatural S4E16 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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Someone finds Lucifer's sword and uses it to kill angels. Castiel and Uriel capture Alastair and try to get Dean to use his torturing skills to learn how to stop the murders.