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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?
S3, EP1 "The Electric Can Opener Fluctuation"
After tampering with Sheldon's Arctic-expedition data, the guys follow him back to Texas, which threatens Leonard's chances for romance with Penny.
S3, EP2 "The Jiminy Conjecture"
Penny and Leonard try to recover from an awkward hookup; Howard and Sheldon make a high-stakes bet.
S3, EP3 "The Gothowitz Deviation"
Howard and Raj hit a Goth nightclub to meet women; Sheldon tries chocolate-based behavior modification on Penny.
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.
S11, EP9 "The Bitcoin Entanglement"
Sheldon tries to teach the guys a lesson after they cut him out of a potentially valuable investment; a seven-year-old video reveals a secret about Leonard and Penny's relationship.
S11, EP8 "The Tesla Recoil"
Leonard and Wolowitz are furious when they learn Sheldon worked with the military behind their backs; Bernadette suspects Ruchi is trying to steal her job.
S11, EP7 "The Geology Methodology"
Sheldon tries to keep his collaboration with Bert a secret; Penny and Bernadette coach Koothrappali on navigating his relationship with Ruchi.
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.
