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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, EP1 "The Robotic Manipulation"
Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.
S12, EP5 "The Planetarium Collision"
When Amy doesn't have time to work on super-asymmetry, Sheldon goes to great lengths to ensure she's available; Koothrappali doesn't want Wolowitz to join him in hosting a show at the planetarium.
S3, EP17 "The Precious Fragmentation"
When the guys buy a ring from "The Lord of the Rings" at a garage sale, the item threatens to tear them apart.
S3, EP18 "The Pants Alternative"
Sheldon's stage fright stands between him and a coveted award.
