Watch The Big Bang Theory Online: Season 9 Episode 21

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Are you team Leonard, or team Sheldon?

On The Big Bang Theory Season 9 Episode 21, everyone was forced to pick a side when the two of them had the mother of all disagreements.

The two men then went into a battle royal, with their friends weighing up the pros and cons of each side, but which one of them had the best argument for staying with them?

Also, Penny got some news that could change her life forever. 

Use the video above to watch The Big Bang Theory online to get up to date with the latest hilarity from these characters.

Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.

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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?