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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?
S6, EP16 "The Tangible Affection Proof"
The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.
S6, EP17 "The Monster Isolation"
After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.
S6, EP18 "The Contractual Obligation Implementation"
Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.
S6, EP19 "The Closet Reconfiguration"
Howard considers whether he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.
S8, EP5 "The Focus Attenuation"
During their weekend in Las Vegas, Bernadette and Amy accuse Penny of being a buzz kill; the guys try to invent the next big thing.
S8, EP4 "The Hook-Up Reverberation"
Raj's honesty comes back to haunt him when his new girlfriend is unfriendly to Penny; the guys think about becoming part owners in Stuart's store.
S8, EP3 "The First Pitch Insufficiency"
Wolowitz feels nervous when he is asked to throw the first pitch at a Los Angeles Angels game; Penny and Leonard want to prove Sheldon wrong after he says he and Amy are the better couple.
S8, EP2 "The Junior Professor Solution"
When Sheldon must teach a class, Howard decides to take it; Amy takes advantage of the tension between Penny and Bernadette.
