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?
Amy and Leonard take a road trip, Penny has an interview at Bernadette's company, and Howard has issues with Stuart's relationship with his mum. S8, Ep1
Howard signs up to take Sheldon's class, and tensions between Penny and Bernadette give Amy an opportunity to play one against the other. S8, Ep2
NASA asks Wolowitz to throw the first pitch at an Angels baseball game. And Sheldon says that he and Amy are a better couple than Leonard and Penny. S8, Ep3
Raj's girlfriend gives Penny the cold shoulder after he tells her about their history, and the guys consider buying into Stuart's comic-book emporium. S8, Ep4
Amy and Bernadette accuse Penny of becoming a party pooper. And the guys brainstorm about inventing something cool. S8, Ep5
Sheldon and Raj go on an expedition that turns into a test of how long before they get under each other's skin. Leonard and Penny argue about money. S8, Ep6
Misinterpretation Agitation. Penny's sales pitch leaves a doctor-client smitten and the guys help her deal with it, and Bernadette and Amy debate female scientists and sexuality. S8, Ep7
Amy and Bernadette organise a prom to be held atop the guys' apartment complex, but Sheldon is leery of all the prom pomp, circumstance and romancing. S8, Ep8
Leonard needs surgery for a deviated septum, and Sheldon feels an operation is too dangerous and that his roommate may not make it out alive. S8, Ep9
Sheldon bids farewell to his Fun With Flags podcast. Leonard, Howard and Raj probe a late professor's research in search of some hidden significance. S8, Ep10
Amy plans a Victorian dinner for Christmas Eve, while Raj, Leonard and Howard try to remove a pigeon that flew into the clean room at the university. S8, Ep11
Raj awaits data from a space probe in which he was involved. Later, Leonard and Sheldon go dress shopping with Penny and Amy. S8, Ep12
Sheldon becomes concerned that his cushy lifestyle is impacting his professional progress, so he asks the gang to make life more difficult for him. S8, Ep13
An online troll rips Leonard and Sheldon's physics paper, and a girls' night out leads to Penny, Amy and Bernadette dishing about embarrassing events. S8, Ep14
Comic Book Store Regeneration. Howard gets unsettling news amidst the excitement of the comic book store reopening, and Penny doesn't practice what she preaches. S8, Ep15
An experiment designed to make people fall in love piques Penny and Leonard's interest. Meanwhile, Leonard, Amy, Raj and Emily encounter a 'zombie.' S8, Ep16
There's trouble in paradise when Amy learns Sheldon signed up for a one-way mission to colonise Mars. Leonard makes an 'adult' purchase for Penny. S8, Ep17
An electrical short thaws the last meal cooked by Mrs. Wolowitz, and Sheldon and Leonard's work is featured in a magazine, but only one gets credit. S8, Ep18
Leonard and Sheldon consider dropping by George Lucas' Skywalker Ranch when a speaking engagement puts them nearby. S8, Ep19
Fortification Implementation. Sheldon and Amy reach a crossroad, a man claiming to be Wolowitz's half-brother shows up, and Penny and Leonard argue live on Wil Wheaton's podcast. S8, Ep20
Communication Deterioration. NASA asks Raj to craft a message for aliens in the event of contact, and Penny must choose between an audition or her job in pharmaceutical sales. S8, Ep21
Wolowitz and Sheldon can't get a drone to fly, Leonard nearly misses giving a commencement address, and Raj pits his parents against each other. S8, Ep22
Leonard and Sheldon's mothers come to town to celebrate their sons getting an award, but the opinionated women engage in an altercation over religion. S8, Ep23
Leonard and Penny are pressured to set a wedding date by Sheldon, whose relationship with Amy has taken an interesting turn. S8, Ep24