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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?
S11, EP23 "The Sibling Realignment"
Sheldon's mother won't attend his wedding unless he invites his brother; the Wolowitz kids inadvertently infest Amy, Bernadette, Wolowitz and Koothrappali with pink eye.
S10, EP7 "The Veracity Elasticity"
Amy lies about repairs being made to her apartment so she can continue living with Sheldon; Leonard lets Penny decorate Sheldon's old room.
S10, EP8 "The Brain Bowl Incubation"
Sheldon is determined to convince Amy they should procreate; Koothrappali is reluctant to tell the gang what the new woman he's dating does for a living.
S10, EP9 "The Geology Elevation"
Sheldon gets jealous when a co-worker wins an award; Wolowitz finds an old remote control Stephen Hawking action figure that he made.
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.
