[s3e15] The Large Hadron Collision -

"The Big Bang Theory" The Large Hadron Collision (TV ... - IMDb

is the 15th episode of the third season of The Big Bang Theory , which originally aired on February 8, 2010. In this Valentine's Day-themed episode, Leonard is invited to visit the Large Hadron Collider in Switzerland and must choose between taking his girlfriend, Penny, or his roommate, Sheldon. Plot Summary [S3E15] The Large Hadron Collision

Leonard ultimately travels to Switzerland with Raj , who is thrilled to enjoy the romantic amenities—like champagne and chocolates—originally intended for Penny. Key Characters & Cast "The Big Bang Theory" The Large Hadron Collision (TV