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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?
S5, EP17 "The Rothman Disintegration"
Sheldon and his nemesis, Kripke, compete for a corner office; Penny feels uncomfortable after receiving a gift from Amy.
S5, EP18 "The Werewolf Transformation"
Sheldon's routine is turned upside down when his barber gets sick; Wolowitz questions his decision to go into space.
S5, EP19 "The Weekend Vortex"
Sheldon chooses to participate in a guys-only weekend Star Wars gaming marathon rather than go with Amy to her aunt's birthday party; he gets a lesson from Penny and Amy.
S5, EP20 "The Transporter Malfunction"
When Penny buys Leonard and Sheldon "Star Trek" collectibles, Sheldon finds himself haunted by Mr. Spock; after a blind date, Raj believes he has met his future wife.
S6, EP17 "The Monster Isolation"
After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.
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, EP15 "The Spoiler Alert Segmentation"
A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.
S6, EP14 "The Cooper/Kripke Inversion"
Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.
