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The Big Bang Theory
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.
S5, EP11 "The Speckerman Recurrence"
Leonard must face the bully who targeted him in high school; Penny confronts her past actions.
S5, EP12 "The Shiny Trinket Maneuver"
Amy is upset with Sheldon when he isn't impressed with her recent accomplishment; Howard struggles with Bernadette's aversion to children.
S5, EP13 "The Recombination Hypothesis"
Everything could change when Leonard spontaneously invites Penny to a romantic dinner.
S12, EP12 "The Propagation Proposition"
Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.
S12, EP11 "The Paintball Scattering"
Penny and Leonard organize a paintball game, which results in mayhem when Sheldon becomes jealous of Amy; Koothrappali catches Anu with her ex-boyfriend; Stuart doesn't want to move in with Denise.
S12, EP10 "The VCR Illumination"
A VHS tape from Sheldon's past inspires him not to give up; Bernadette turns into a pageant mom when she tries to help Wolowitz with his Magic Castle audition.
S12, EP9 "The Citation Negation"
Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been discovered and disproved; Bernadette wants to beat Howard in a popular video game.