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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, EP3 "The Higgs Boson Observation"
Amy feels threatened by Sheldon's new assistant; Wolowitz starts to feel the pressures of being in space.
S2, EP16 "The Cushion Saturation"
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S7, EP23 "The Gorilla Dissolution"
A bad day compels Penny to re-evaluate her choices -- including Leonard; Bernadette and Howard must care for Mrs. Wolowitz; Sheldon gives Raj advice on relationships.
S7, EP24 "The Status Quo Combustion"
Faced with an uncertain future, Sheldon considers a major change; Emily and Raj decide to take things to the next level.
S9, EP4 "The 2003 Approximation"
An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.
S9, EP3 "The Bachelor Party Corrosion"
A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills; Penny is compelled to tell her family that she and Leonard eloped.
S9, EP2 "The Separation Oscillation"
Leonard tries to ease Penny's mind; Sheldon plans a special episode of "Fun With Flags"; Bernadette feels bad about keeping a secret.
S9, EP1 "The Matrimonial Momentum"
Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.
