Watch How I Met Your Mother Season 4 Episode 16 online via TV Fanatic with over 9 options to watch the How I Met Your Mother S4E16 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, Netflix, YouTube Purchase, Google Play, Lifetime, Verizon On Demand, and TV Land.
|YouTube Purchase||Watch Now|
|Google Play||Watch Now|
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.