Watch The Big Bang Theory Season 9 Episode 21 online via TV Fanatic with over 6 options to watch the The Big Bang Theory 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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Episode Details

On The Big Bang Theory Season 9 Episode 21, an argument between Leonard and Sheldon becomes a heated fight during a get-together with friends taking sides.

Rating: 3.5 / 5.0 (135 Votes)
The Big Bang Theory
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The Big Bang Theory Season 9 Episode 21 Quotes

Sheldon: We're only watching Game of Thrones. A party sub implies it's a party.
Leonard: Your attendance implies it's not.

Raj: Actually, I'm seeing both of them.
Leonard: You mean like through their window from behind a bush?