Watch The Big Bang Theory Season 11 Episode 21 online via TV Fanatic with over 6 options to watch the The Big Bang Theory S11E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and Verizon On Demand.
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On The Big Bang Theory Season 11 Episode 21, friendships end up being threatened when Koothrappali takes credit for Penny's astronomical discovery.