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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?
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.
S3, EP21 "The Plimpton Stimulation"
Sheldon invites a famous physicist to the apartment, and competes with Leonard for her attention.
S3, EP8 "The Adhesive Duck Deficiency"
Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.
S3, EP9 "The Vengeance Formulation"
After being humiliated on the radio, Sheldon vows to destroy Kripke; Wolowitz tries not to ruin his new relationship with Bernadette.
S3, EP8 "The Adhesive Duck Deficiency"
Penny is forced to rely on Sheldon when she is injured while Howard, Leonard and Raj are away.
S3, EP7 "The Guitarist Amplification"
Sheldon tries to make peace when Leonard and Penny get into an argument.
S3, EP6 "The Cornhusker Vortex"
Sheldon teaches Leonard how to understand football; a kite-fighting incident threatens Howard and Raj's friendship.
S3, EP5 "The Creepy Candy Coating Corollary"
Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends.
