Watch How I Met Your Mother Season 8 Episode 20 online via TV Fanatic with over 7 options to watch the How I Met Your Mother S8E20 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, and Verizon On Demand.
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While Marshall and Robin have a dance off, Ted and Barney's future doppelgangers try to convince them to attend Robots vs. Wrestlers.