Watch How I Met Your Mother Season 9 Episode 21 online via TV Fanatic with over 6 options to watch the How I Met Your Mother S9E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and Verizon On Demand.
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Gary Blauman arrives at the wedding and the gang remembers their previous encounters on How I Met Your Mother.