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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, 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.
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.
S12, EP22 "The Maternal Conclusion"
Leonard is pleasantly surprised when Beverly comes to visit, and she's genuinely kind to him, until he finds out the real reason she's there; Denise and Stuart overstay their welcome at the Wolowitz house.