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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, EP17 "The Celebration Experimentation"
For the first time in nine years, the gang celebrates Sheldon's birthday -- surprising him with a special guest.
S11, EP24 "The Bow Tie Asymmetry"
When Amy's parents and Sheldon's family arrive, everybody is focused on making sure the wedding arrangements go according to plan -- everyone except the bride and groom.
S12, EP2 "The Wedding Gift Wormhole"
Sheldon and Amy go crazy trying to figure out what "perfect gift" Leonard and Penny gave them for their wedding; Koothrappali decides to settle down and asks his father to arrange a marriage for him.
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.
