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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, EP6 "The Irish Pub Formulation"
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
S4, EP7 "The Apology Insufficiency"
Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.
S4, EP8 "The 21-Second Excitation"
While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
S4, EP9 "The Boyfriend Complexity"
Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.
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.
