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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, 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.
S2, EP18 "The Work Song Nanocluster"
Penny's home business turns into a complete nightmare when Sheldon takes over.
S10, EP23 "The Gyroscopic Collapse"
After celebrating the completion of the top-secret Air Force project, Leonard, Sheldon and Wolowitz get an unwelcome surprise; Amy receives an offer for a summer position as a visiting researcher.
S10, EP22 "The Cognition Regeneration"
Leonard is less than thrilled when Penny considers accepting a job offer from Zack, her ex-boyfriend.
S10, EP21 "The Separation Agitation"
Howard and Bernadette struggle to leave Halley in day care; Bert introduces the gang to his new girlfriend, Rebecca.
S10, EP20 "The Recollection Dissipation"
Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as well as Amy on the same day; Bernadette nears the end of her maternity leave and must return to work.
