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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, EP13 "The Friendship Algorithm"
Sheldon develops a scientific procedure for making friends; Kripke controls a new supercomputer.
S2, EP14 "The Financial Permeability"
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
S2, EP15 "The Maternal Capacitance"
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother (Christine Baranski).
S2, EP16 "The Cushion Saturation"
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
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.
