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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?
S9, EP4 "The 2003 Approximation"
An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.
S6, EP2 "The Decoupling Fluctuation"
Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard; Howard is picked on in space by the other astronauts.
S2, EP15 "The Maternal Capacitance"
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother (Christine Baranski).
S7, EP18 "The Mommy Observation"
Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.
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.
