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The Big Bang Theory S3E15 poster

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

The Big Bang Theory • Season 3, Episode 15 • 21 min • 2007 • ⭐ 7.9/10 • Comedy

Cast: Jim Parsons , Kaley Cuoco , Johnny Galecki , Simon Helberg , Kunal Nayyar , Melissa Rauch , Mayim Bialik

Directors: Chuck Lorre , Bill Prady

Watch The Big Bang Theory – S3E15

Episode Overview

Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.

Episode Navigation

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