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A wealthy donor makes Leonard question what he is willing to do for science.

A wealthy donor makes Leonard question what he is willing to do for science.

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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

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

S8, EP22 "The Graduation Transmission"

Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.

The Big Bang Theory

S8, EP23 "The Maternal Combustion"

When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores -- with a little help from his friends.

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, Brian George, Jim Parsons, John Ross Bowie, Johnny Galecki, Kaley Cuoco, Kaley Cuoco-Sweeting, Kevin Sussman, Kunal Nayyar, Laura Spencer, Mayim Bialik, Melissa Rauch, Sara Gilbert, Simon Helberg, Wil Wheaton
Original Air Date: Sep 24, 2007
Genres: ComedyTV Series
Rating: TVPG
Playback: HD
6 seasons available on demand
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