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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, EP8 "The Isolation Permutation"
Amy is devastated when Penny and Bernadette shop for wedding dresses without her.
S5, EP9 "The Ornithophobia Diffusion"
Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.
S5, EP10 "The Flaming Spittoon Acquisition"
Sheldon is jealous when Stuart (Kevin Sussman), a guy from the comic book store, asks Amy out on a date.
S5, EP11 "The Speckerman Recurrence"
Leonard must face the bully who targeted him in high school; Penny confronts her past actions.
S9, EP8 "The Mystery Date Observation"
Sheldon, Wolowitz and Koothrappali post an ad online to find a new girlfriend for Sheldon; Penny and Bernadette decide to spy when Amy is secretive about who she is dating.
S9, EP7 "The Spock Resonance"
Sheldon struggles to keep his emotions in check when he is interviewed for a documentary about Spock; Penny and Leonard make a surprising discovery; Wolowitz and Bernadette get into a disagreement about remodeling his childhood home.
S9, EP6 "The Helium Insufficiency"
Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to find Amy a new man on a dating app.
S9, EP5 "The Perspiration Implementation"
Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.
