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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, EP1 "The Matrimonial Momentum"
Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.
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.
S9, EP11 "The Opening Night Excitation"
After dating for more than five years, Amy and Sheldon spend the night together for the first time; Leonard, Wolowitz, and Koothrappali must decide what to do with an extra movie ticket.
S10, EP3 "The Dependence Transcendence"
Sheldon tries to stay awake with an energy drink as the gang races to finish its government project on time; Penny and Amy attend a gathering at Bert the Geologist's house; Koothrappali learns Bernadette's true feelings about her pregnancy.
S12, EP18 "The Laureate Accumulation"
When competitors Pemberton and Campbell charm America on a publicity tour, Sheldon and Amy try to win over Nobel laureates Kip Thorne, George Smoot and Frances Arnold; Halley's fear of the dark leads to opportunity and conflict.
S12, EP17 "The Conference Valuation"
When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is left in charge of the kids; Sheldon finds a book about experimenting on kids.
S12, EP16 "The D & D Vortex"
The gang uses deception and betrayal to make it to the one open seat at Wil Wheaton's celebrity Dungeons and Dragons game with William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith.
S12, EP15 "The Donation Oscillation"
Penny tries to throw a wrench into Leonard's plan to be a sperm donor for her ex-boyfriend; Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip aboard the "vomit comet."
