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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?
S2, EP23 "The Monopolar Expedition"
While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.
S7, EP18 "The Mommy Observation"
Sheldon is faced with a new reality when he visits his mom in Houston; a murder mystery party starts arguments.
S8, EP23 "The Maternal Combustion"
When Sheldon's and Leonard's mothers finally meet, personalities collide; Howard decides to do his share of the chores -- with a little help from his friends.
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.
S10, EP15 "The Locomotion Reverberation"
Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system; Raj and Stuart look after baby Halley while Penny and Amy take Bernadette for a night out.
S10, EP14 "The Emotion Detection Automation"
Sheldon tests an MIT invention after hearing it can help him read people's emotions; Leonard finds out Penny's brother is coming to town; Raj asks his ex-girlfriends to give him dating advice.
S10, EP13 "The Romance Recalibration"
Penny thinks Leonard is taking her for granted and decides to go on a spa weekend with Amy; Wolowitz and Koothrappali try to fix a squeaky floorboard in the baby's room.
S10, EP12 "The Holiday Summation"
Sheldon and Amy visit Penny and Leonard after the holidays and tell them about their terrible trip to Texas.
