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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?
S10, EP18 "The Escape Hatch Identification"
Leonard and Penny offer Sheldon's old room to Raj after he moves out of his apartment.
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.
S10, EP17 "The Comic-Con Conundrum"
Cut off from his father's fortune, Koothrappali appoints Sheldon to help him get out of debt; Penny considers joining Leonard at Comic-Con.
S1, EP1 "Pilot"
Leonard is happy to meet new neighbor Penny, but his roommate thinks he is chasing an impossible dream.
