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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, EP17 "The Colonization Application"
Amy finds out that Sheldon applied for a one-way mission to colonize Mars; a trip to the pet store leads to a fight; Leonard has a surprise for Penny; Raj is busted while snooping in Emily's apartment.
S8, EP18 "The Leftover Thermalization"
A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard; a blackout at Mrs. Wolowitz's results in a final dinner in her honor.
S8, EP19 "The Skywalker Incursion"
When Sheldon and Leonard are asked to speak at UC Berkeley, they take a detour in hope of meeting an idol; Raj and Amy try to settle a dispute between Howard and Bernadette with a game of ping pong.
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, EP8 "The Isolation Permutation"
Amy is devastated when Penny and Bernadette shop for wedding dresses without her.
S5, EP6 "The Rhinitis Revelation"
Sheldon finds himself competing with the gang for his mother's (Laurie Metcalf) attention when she visits.
S5, EP5 "The Russian Rocket Reaction"
Wil Wheaton invites Leonard and Sheldon to a party at his house; Howard receives an opportunity.
S5, EP4 "The Wiggly Finger Catalyst"
Raj wants a girlfriend, so Penny introduces him to a woman he can communicate with.
