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Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

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The Big Bang Theory

S8, EP20 "The Fortification Implementation"

Sheldon and Amy build a blanket fort -- and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.

The Big Bang Theory

S1, EP5 "The Hamburger Postulate"

Leonard, realizing his pursuit of Penny is fruitless, has an unexpected encounter with a fellow scientist (Sara Gilbert).

The Big Bang Theory

S3, EP15 "The Large Hadron Collision"

Leonard must choose who to bring with him when he goes to see the Large Hadron Collider on Valentine's Day.

The Big Bang Theory

S8, EP21 "The Communication Deterioration"

The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.

The Big Bang Theory

S10, EP11 "The Birthday Synchronicity"

While Howard and Bernadette welcome their new baby into the world, Amy celebrates her own birthday with Sheldon.

The Big Bang Theory

S10, EP10 "The Property Division Collision"

Sheldon and Leonard disagree about how to divide their shared belongings; Koothrappali and Stuart fight to be the most helpful to Bernadette during her final weeks of pregnancy.

The Big Bang Theory

S10, EP9 "The Geology Elevation"

Sheldon gets jealous when a co-worker wins an award; Wolowitz finds an old remote control Stephen Hawking action figure that he made.

The Big Bang Theory

S10, EP8 "The Brain Bowl Incubation"

Sheldon is determined to convince Amy they should procreate; Koothrappali is reluctant to tell the gang what the new woman he's dating does for a living.

Mensa-fied best friends and roommates Leonard and Sheldon, physicists who work at the California Institute of Technology, may be able to tell everybody more than they want to know about quantum physics, but getting through most basic social situations, especially ones involving women, totally baffles them. How lucky, then, that babe-alicious waitress/aspiring actress Penny moves in next door. Frequently seen hanging out with Leonard and Sheldon are friends and fellow Caltech scientists Wolowitz and Koothrappali. Will worlds collide? Does Einstein theorize in the woods?
Starring: Christine Baranski, Jim Parsons, John Ross Bowie, Johnny Galecki, Kaley Cuoco, Kaley Cuoco-Sweeting, Kevin Sussman, Kunal Nayyar, Laura Spencer, Laurie Metcalf, Mayim Bialik, Melissa Rauch, Sara Gilbert, Simon Helberg, Wil Wheaton
Original Air Date: Sep 24, 2007
Genres: ComedyTV Series
Rating: TVPG
Playback: HD
2 seasons available on demand
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