The Big Bang Theory

2007•6 series•Entertainment / Drama
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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?

The Vengeance Formulation: Episode Image
Episode 9The Vengeance Formulation

Barry Kripke pranks Sheldon during his spot on NPR, leaving him wanting vengeance. Bernadette pressures Wolowitz to define their relationship.(S03,E09)

The Gorilla Experiment: Episode Image
Episode 10The Gorilla Experiment

Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment.(S03,E10)

The Maternal Congruence: Episode Image
Episode 11The Maternal Congruence

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon.(S03,E11)

The Psychic Vortex: Episode Image
Episode 12The Psychic Vortex

Leonard is aghast to find out that Penny believes in psychics. Sheldon tries to assist Koothrappali in picking up a girl at a university party.(S03,E12)

The Bozeman Reaction: Episode Image
Episode 13The Bozeman Reaction

A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.(S03,E13)

The Einstein Approximation: Episode Image
Episode 14The Einstein Approximation

Stuck on the solution to a physics problem, Sheldon tries different methods to change his thinking, including working at The Cheesecake Factory.(S03,E14)

The Large Hadron Collision: Episode Image
Episode 15The Large Hadron Collision

When Leonard is offered a trip to Switzerland on Valentine's Day to see a particle accelerator, he must choose between taking Penny or Sheldon.(S03,E15)

The Excelsior Acquisition: Episode Image
Episode 16The Excelsior Acquisition

An appearance in traffic court comes at the worst possible time for Sheldon, the same day Stan Lee is appearing at the comic book store.(S03,E16)

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