The Big Bang Theory
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The Large Hadron Collision
Season 3 - Episode 15

Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider in Switzerland on Valentine's Day.

Production Number:
Aired On: Monday 8th of February 2010 on CBS ( US )
Written by: TBA
Directed by: TBA
Starring: Johnny Galecki as Leonard Hofstadter
Jim Parsons as Sheldon Cooper
Kaley Cuoco as Penny
Simon Helberg as Howard Wolowitz
Kunal Nayyar as Raj Koothrappali
Erin Pickett as Cafeteria Patron ( uncredited )


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