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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?
S4, EP19 "The Zarnecki Incursion"
The guys try to figure out who hacked Sheldon's online-game account.
S10, EP1 "The Conjugal Conjecture"
The group struggles through an awkward morning after Sheldon's mother and Leonard's father spend an evening together; Penny's family arrives.
S4, EP16 "The Cohabitation Formulation"
Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.
S4, EP17 "The Toast Derivation"
Sheldon is upset when he realizes Leonard is the center of their group of friends.
S12, EP2 "The Wedding Gift Wormhole"
Sheldon and Amy go crazy trying to figure out what "perfect gift" Leonard and Penny gave them for their wedding; Koothrappali decides to settle down and asks his father to arrange a marriage for him.
S12, EP1 "The Conjugal Configuration"
Sheldon and Amy's honeymoon runs aground in New York; Penny and Leonard discover they are uncomfortably similar to Amy's parents; Koothrappali insults physicist Neil deGrasse Tyson and starts a Twitter war.