Watch How I Met Your Mother Season 2 Episode 21 online via TV Fanatic with over 8 options to watch the How I Met Your Mother S2E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, Verizon On Demand, and TV Land.
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By the time their wedding day arrives, nothing turns out as Lily and Marshall have planned. Barney steps in to help save the day.