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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, 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.
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, 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, 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.
S10, EP6 "The Fetal Kick Catalyst"
Penny learns there are fans of her performance in "Serial Ape-ist" when she and Leonard attend a Comic Con event; Amy hosts a brunch at Penny's apartment; Wolowitz makes an impulsive purchase.
S10, EP5 "The Hot Tub Contamination"
Things do not run smoothly when Amy moves in with Sheldon, and Leonard and Penny have to intervene; Howard and Bernadette find unexpected guests at their house when they decide to cancel their vacation plans.
S10, EP4 "The Cohabitation Experimentation"
After her apartment floods, Amy suggests that she and Sheldon move in together; Koothrappali finds out the gender of Howard and Bernadette's baby before they do.
S10, EP3 "The Dependence Transcendence"
Sheldon tries to stay awake with an energy drink as the gang races to finish its government project on time; Penny and Amy attend a gathering at Bert the Geologist's house; Koothrappali learns Bernadette's true feelings about her pregnancy.
