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Leonard tells Penny about how he met Sheldon and what happened to the elevator.

Leonard tells Penny about how he met Sheldon and what happened to the elevator.

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The Big Bang Theory

S8, EP17 "The Colonization Application"

Amy finds out that Sheldon applied for a one-way mission to colonize Mars; a trip to the pet store leads to a fight; Leonard has a surprise for Penny; Raj is busted while snooping in Emily's apartment.

The Big Bang Theory

S8, EP18 "The Leftover Thermalization"

A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard; a blackout at Mrs. Wolowitz's results in a final dinner in her honor.

The Big Bang Theory

S8, EP19 "The Skywalker Incursion"

When Sheldon and Leonard are asked to speak at UC Berkeley, they take a detour in hope of meeting an idol; Raj and Amy try to settle a dispute between Howard and Bernadette with a game of ping pong.

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

S5, EP8 "The Isolation Permutation"

Amy is devastated when Penny and Bernadette shop for wedding dresses without her.

The Big Bang Theory

S5, EP6 "The Rhinitis Revelation"

Sheldon finds himself competing with the gang for his mother's (Laurie Metcalf) attention when she visits.

The Big Bang Theory

S5, EP5 "The Russian Rocket Reaction"

Wil Wheaton invites Leonard and Sheldon to a party at his house; Howard receives an opportunity.

The Big Bang Theory

S5, EP4 "The Wiggly Finger Catalyst"

Raj wants a girlfriend, so Penny introduces him to a woman he can communicate with.

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: Aarti Mann, Christine Baranski, Jim Parsons, John Ross Bowie, Johnny Galecki, Kaley Cuoco, Kaley Cuoco-Sweeting, Kate Micucci, Kevin Sussman, Kunal Nayyar, Laura Spencer, Mayim Bialik, Melissa Rauch, 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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