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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, EP12 "The Psychic Vortex"
Sheldon and Koothrappali attend a university mixer; Leonard discovers that Penny believes in psychics.
S11, EP17 "The Athenaeum Allocation"
Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy; Bernadette and Wolowitz have a hard time deciding who should stay at home with the kids and who should go back to work.
S3, EP19 "The Wheaton Recurrence"
Penny and Leonard have a fight that threatens their relationship; Sheldon and Wil Wheaton face off once again.
S3, EP20 "The Spaghetti Catalyst"
Sheldon goes to extremes to keep Leonard and Penny happy when they stop speaking to each other.
