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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?
S1, EP9 "The Cooper-Hofstadter Polarization"
Penny tries to mediate when Sheldon and Leonard disagree on whether to present their joint findings at a physics conference.
S1, EP10 "The Loobenfeld Decay"
Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing, but the elaborate lie Sheldon tells leads to an unexpected result.
S1, EP11 "The Pancake Batter Anomaly"
Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.
S1, EP12 "The Jerusalem Duality"
Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.
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.
