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Looking to watch The Big Bang Theory Season 3 Episode 15 online? TV Fanatic is your destination for every paid and free streaming option of the The Big Bang Theory S3E15 full episode from 2 affiliates.

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Episode Details

The Big Bang Theory Season 3 Episode 15: "The Large Hadron Collision"

When Leonard is giving a plus one to go to Switzerland to see the Large Hadron Collider on Valentine's Day, Sheldon tries to convince Leonard to take him over Penny.