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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, EP3 "The Gothowitz Deviation"
Howard and Raj hit a Goth nightclub to meet women; Sheldon tries chocolate-based behavior modification on Penny.
S3, EP4 "The Pirate Solution"
Raj faces deportation if he does not find a job; Leonard and Penny deal with Howard as a third wheel.
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.
S3, EP6 "The Cornhusker Vortex"
Sheldon teaches Leonard how to understand football; a kite-fighting incident threatens Howard and Raj's friendship.
S5, EP9 "The Ornithophobia Diffusion"
Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.
S5, EP8 "The Isolation Permutation"
Amy is devastated when Penny and Bernadette shop for wedding dresses without her.
S5, EP7 "The Good Guy Fluctuation"
An attractive comic book artist tests Leonard and Priya's relationship; Sheldon tries to scare his friends.
S5, EP6 "The Rhinitis Revelation"
Sheldon finds himself competing with the gang for his mother's (Laurie Metcalf) attention when she visits.