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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?
S4, EP17 "The Toast Derivation"
Sheldon is upset when he realizes Leonard is the center of their group of friends.
S12, EP22 "The Maternal Conclusion"
Leonard is pleasantly surprised when Beverly comes to visit, and she's genuinely kind to him, until he finds out the real reason she's there; Denise and Stuart overstay their welcome at the Wolowitz house.
S9, EP17 "The Celebration Experimentation"
For the first time in nine years, the gang celebrates Sheldon's birthday -- surprising him with a special guest.
S9, EP18 "The Application Deterioration"
Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.
