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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?
S2, EP16 "The Cushion Saturation"
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S2, EP17 "The Terminator Decoupling"
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is aboard the train they are taking to San Francisco.
S2, EP18 "The Work Song Nanocluster"
Penny's home business turns into a complete nightmare when Sheldon takes over.
S2, EP19 "The Dead Hooker Juxtaposition"
Penny develops a rivalry with a sexy new female neighbor who threatens her position as queen bee of the building.
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.
