Watch How I Met Your Mother Season 4 Episode 16 online via TV Fanatic with over 7 options to watch the How I Met Your Mother S4E16 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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Ted's old college girlfriend Karen (Laura Prepon) comes back into Ted's life, making Marshall and Lily remember just how much they hated her, something they never told Ted.