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The Big Bang Theory
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?
S2, EP8 "The Lizard-Spock Expansion"
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
S10, EP16 "The Allowance Evaporation"
Sheldon and Amy have their first fight since moving in together; Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.
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.
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.
S11, EP8 "The Tesla Recoil"
Leonard and Wolowitz are furious when they learn Sheldon worked with the military behind their backs; Bernadette suspects Ruchi is trying to steal her job.
S11, EP7 "The Geology Methodology"
Sheldon tries to keep his collaboration with Bert a secret; Penny and Bernadette coach Koothrappali on navigating his relationship with Ruchi.
S11, EP6 "The Proton Regeneration"
Sheldon auditions for the role of the new Professor Proton; Penny takes care of Halley when Bernadette and Wolowitz need bed rest.
S11, EP5 "The Collaboration Contamination"
Sheldon and Koothrappali confide in Bernadette when they can't handle Amy and Wolowitz working together; Penny and Leonard learn a secret from an unlikely source about dealing with Sheldon.