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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?
S8, EP20 "The Fortification Implementation"
Sheldon and Amy build a blanket fort -- and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.
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.
S5, EP23 "The Launch Acceleration"
Wedding plans are jeopardized when NASA reschedules Howard's mission; Leonard says something in the bedroom that surprises Penny.
S6, EP8 "The 43 Peculiarity"
Raj and Howard try to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.
S11, EP16 "The Neonatal Nomenclature"
When Bernadette won't go into labor, her friends try different tactics to get things started; Wolowitz confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.
S11, EP15 "The Novelization Correlation"
Sheldon petitions Wil Wheaton to appear on the new "Professor Proton" show, but Wil offers a role to Amy instead; Penny gets angry when she thinks the female protagonist in Leonard's novel is based on her.
S11, EP14 "The Separation Triangulation"
Koothrappali learns the woman he's dating has a very upset husband; Sheldon rents his old room for a quiet place to work.
S11, EP13 "The Solo Oscillation"
Sheldon kicks Amy out to work solo; Amy and Leonard bond during a series of science experiments; Bert replaces Wolowitz in the band; Sheldon finds Penny a surprising source of scientific inspiration.
