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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, EP11 "The Opening Night Excitation"
After dating for more than five years, Amy and Sheldon spend the night together for the first time; Leonard, Wolowitz, and Koothrappali must decide what to do with an extra movie ticket.
S9, EP12 "The Sales Call Sublimination"
Leonard agrees to meet with a psychiatrist (Jane Kaczmarek) on Penny's behalf; Sheldon and Koothrappali work together on an astronomical discovery; Wolowitz and Bernadette struggle with their feelings when Stuart moves out.
S9, EP13 "The Empathy Optimization"
After dealing with Sheldon while he was sick, Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.
S9, EP14 "The Meemaw Materialization"
Sheldon's excitement about his Meemaw's visit fades when she butts heads with Amy; Raj questions his relationship with Emily after meeting someone new.
S9, EP10 "The Earworm Reverberation"
Sheldon has a song stuck in his head; despite their awkward date, Amy asks Dave over for dinner; Koothrappali and Wolowitz are obsessed with a fan of their band.
S9, EP9 "The Platonic Permutation"
Amy and Sheldon spend Thanksgiving at the aquarium -- as friends; Wolowitz volunteers at the soup kitchen with Raj, Emily and Bernadette; Penny realizes that Leonard knows her better than she thought.
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.