The Big Bang Theory The Large Hadron Collision (Season 3, Episode 15)
TV-PG
TV Episode | 21 min | Comedy, Romance

Primary photo for The Large Hadron Collision

The Big Bang Theory

The Large Hadron Collision (Season 3, Episode 15)

TV-PG

TV Episode | 21 min | Comedy, Romance

When Leonard is offered a trip to Switzerland on Valentine's Day to visit the CERN laboratory, Sheldon uses any and all means to be his guest instead of Penny.

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Cast	+ Add Cast
7 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Penny See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Erin Pickett Cafeteria Patron (uncredited) Cafeteria Patron (uncredited) See fewer	Once Upon a Time... in Hollywood (2019)
Lisa Randall Extra (uncredited) Extra (uncredited) See fewer	Nova (1974)