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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?
S6, EP15 "The Spoiler Alert Segmentation"
A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.
S3, EP4 "The Pirate Solution"
Raj faces deportation if he does not find a job; Leonard and Penny deal with Howard as a third wheel.
S7, EP11 "The Cooper Extraction"
While Sheldon is in Texas, the rest of the gang realize how much he has changed their lives as they decorate the apartment Christmas tree.
S10, EP12 "The Holiday Summation"
Sheldon and Amy visit Penny and Leonard after the holidays and tell them about their terrible trip to Texas.
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.
S11, EP6 "The Proton Regeneration"
Sheldon auditions for the role of the new Professor Proton; Penny takes care of Halley when Bernadette and Wolowitz need bed rest.
S11, EP5 "The Collaboration Contamination"
Sheldon and Koothrappali confide in Bernadette when they can't handle Amy and Wolowitz working together; Penny and Leonard learn a secret from an unlikely source about dealing with Sheldon.
S11, EP4 "The Explosion Implosion"
Wolowitz and Sheldon bond over having disappointing fathers; Leonard is disturbed when his mother finds a new best friend in Penny.
