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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?
S4, EP3 "The Zazzy Substitution"
When Sheldon searches for an alternative to human companionship, the guys become concerned.
S4, EP4 "The Hot Troll Deviation"
An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.
S4, EP5 "The Desperation Emanation"
Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.
S3, EP16 "The Excelsior Acquisition"
Sheldon ends up in traffic court after getting a ticket because of Penny.
S8, EP16 "The Intimacy Acceleration"
Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love; Howard and Bernadette get into trouble at the airport.
S8, EP15 "The Comic Book Store Regeneration"
While the gang waits for the reopening of Stuart's comic book store Wolowitz gets some shocking news; Penny has trouble taking her own advice; Leonard and Raj think they spot Nathan Fillion at a restaurant.
S8, EP14 "The Troll Manifestation"
Sheldon and Leonard must defend themselves from an online bully's criticism after they co-publish a paper; Bernadette, Penny and Amy confront embarrassing moments during a girls night.
S8, EP13 "The Anxiety Optimization"
Sheldon asks his friends to challenge him in hope of achieving a scientific breakthrough; Wolowitz invents a game about Raj.
