Watch South Park Season 15 Episode 13 online via TV Fanatic with over 8 options to watch the South Park S15E13 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, South Park Studios, and Verizon On Demand.
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The South Park kids watch a History Channel Thanksgiving and believe that aliens were involved in this holiday. Well, at least Cartman seems to buy it.