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The Big Bang Theory
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?
S3, EP11 "The Maternal Congruence"
Leonard is horrified when his mother (Christine Baranski) visits.
S10, EP13 "The Romance Recalibration"
Penny thinks Leonard is taking her for granted and decides to go on a spa weekend with Amy; Wolowitz and Koothrappali try to fix a squeaky floorboard in the baby's room.
S4, EP11 "The Justice League Recombination"
The guys try to bond with Penny's new boyfriend through a costume contest.
S6, EP11 "The Santa Simulation"
During a game, Sheldon revisits Christmas memories; Amy, Penny and Bernadette look for a date for Koothrappali.
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, 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, EP6 "The Fetal Kick Catalyst"
Penny learns there are fans of her performance in "Serial Ape-ist" when she and Leonard attend a Comic Con event; Amy hosts a brunch at Penny's apartment; Wolowitz makes an impulsive purchase.
S10, EP5 "The Hot Tub Contamination"
Things do not run smoothly when Amy moves in with Sheldon, and Leonard and Penny have to intervene; Howard and Bernadette find unexpected guests at their house when they decide to cancel their vacation plans.
