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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?
S4, EP3 "The Zazzy Substitution"
When Sheldon searches for an alternative to human companionship, the guys become concerned.
S4, EP4 "The Hot Troll Deviation"
An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.
S4, EP5 "The Desperation Emanation"
Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend.
S4, EP6 "The Irish Pub Formulation"
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
S12, EP24 "The Stockholm Syndrome"
Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; Koothrappali makes a new friend; the gang travels together into an uncharted future.
S12, EP23 "The Change Constant"
Sheldon and Amy await big news.
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.
