Season 3, Episode 15 The Large Hadron Collision

First Aired: February 8, 2010

Leonard is only allowed to bring one guest for his trip to the CERN science complex in Switzerland, and he's forced to choose between Sheldon and Penny.

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  • Premiered: September 24, 2007
  • Rating: TV-PG
  • User Rating:4.58 out of 5 (8,996 ratings)
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  • Premise: Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated. Like the universe after the big bang, the show's popularity expanded, thanks to breakout star Jim Parsons, along with the… (more)

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