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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?
S3, EP22 "The Staircase Implementation"
Leonard tells Penny about how he met Sheldon and what happened to the elevator.
S3, EP23 "The Lunar Excitation"
Raj and Howard set up an online dating profile for Sheldon and find the perfect woman.
S4, EP1 "The Robotic Manipulation"
Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.
S4, EP2 "The Cruciferous Vegetable Amplification"
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
S7, EP9 "The Thanksgiving Decoupling"
When the gang decides to spend Thanksgiving at Mrs. Wolowitz's house, Sheldon protests; Leonard and Penny deal with an error from her past.
S7, EP8 "The Itchy Brain Simulation"
When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.
S7, EP7 "The Proton Displacement"
When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.
S7, EP6 "The Romance Resonance"
Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.
