Summary: 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?
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S08, E08 (First Aired:
Sheldon feels pressured to participate in romantic traditions when the gang re-creates a high-school prom on the roof.
S08, E09 (First Aired:
Leonard has minor surgery on his nose, causing Sheldon to overreact; Bernadette and Howard work on their marriage.
S08, E10 (First Aired:
Sheldon says goodbye to Fun With Flags; Howard, Leonard and Raj look through their dead professor's research; Bernadette learns her co-workers' true feelings.
S08, E11 (First Aired:
Leonard and Wolowitz clash over a work emergency; Amy throws a Victorian Christmas party which Sheldon resents.
S08, E12 (First Aired:
When the guys agree to do something the girls like, Sheldon and Leonard end up having a confrontation.
S08, E13 (First Aired:
Sheldon asks his friends to challenge him in hope of achieving a scientific breakthrough; Wolowitz invents a game about Raj.
S08, E14 (First Aired:
Sheldon and Leonard must defend themselves from an online bully's criticism after they co-publish a paper; Bernadette, Penny and Amy confront embarrassing moments during a girls night.
S08, E15 (First Aired:
While the gang waits for the reopening of Stuart's comic book store Wolowitz gets some shocking news; Penny has trouble taking her own advice; Leonard and Raj think they spot Nathan Fillion at a restaurant.
S08, E16 (First Aired:
Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love; Howard and Bernadette get into trouble at the airport.
S08, E17 (First Aired:
Amy finds out that Sheldon applied for a one-way mission to colonize Mars; a trip to the pet store leads to a fight; Leonard has a surprise for Penny; Raj is busted while snooping in Emily's apartment.
S08, E18 (First Aired:
A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard; a blackout at Mrs. Wolowitz's results in a final dinner in her honor.
S08, E19 (First Aired:
When Sheldon and Leonard are asked to speak at UC Berkeley, they take a detour in hope of meeting an idol; Raj and Amy try to settle a dispute between Howard and Bernadette with a game of pingpong.
S08, E20 (First Aired:
Sheldon and Amy build a blanket fort -- and come to a crossroads in their relationship; Wolowitz meets a half-brother he didn't know he had; Leonard and Penny have an argument during an appearance on Wil Wheaton's podcast.
S08, E21 (First Aired:
The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job.
S08, E22 (First Aired:
Wolowitz questions his engineering skills after he and Sheldon can't get a toy drone to fly; a canceled flight puts Leonard's plans in jeopardy; Raj sets his parents against one another after he's cut off financially.
S08, E23 (First Aired:
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.
S08, E24 (First Aired:
While facing dramatic changes in his relationship with Amy, Sheldon pushes Penny and Leonard to choose a wedding date.
S01, E01 (First Aired:
Leonard is happy to meet new neighbor Penny, but his roommate thinks he is chasing an impossible dream.
S09, E18 (First Aired:
Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.
S01, E02 (First Aired:
Leonard volunteers to sign for a package, hoping to make a good impression on Penny.
S01, E03 (First Aired:
Unhappy to learn that Penny is seeing someone, Leonard summons the courage to ask another woman on a date.
S01, E04 (First Aired:
Getting fired gives Sheldon the opportunity to explore life beyond physics, but when he spends his time weaving ponchos and acting like a shut-in, Leonard calls Sheldon's mother for assistance.
S01, E05 (First Aired:
Leonard, realizing his pursuit of Penny is fruitless, has an unexpected encounter with a fellow scientist (Sara Gilbert).
S01, E07 (First Aired:
Penny sleeps on Leonard and Sheldon's couch when Wolowitz seduces her friend and takes over her apartment; in need of a fourth member, the guys ask Penny to join their ``Halo'' team.
S01, E08 (First Aired:
On a blind date, Koothrappali discovers that he can talk to the opposite sex after a few drinks, but his date takes an interest in Sheldon.
S01, E09 (First Aired:
Penny tries to mediate when Sheldon and Leonard disagree on whether to present their joint findings at a physics conference.
S01, E10 (First Aired:
Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing, but the elaborate lie Sheldon tells leads to an unexpected result.
S01, E11 (First Aired:
Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.
S01, E12 (First Aired:
Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.
S01, E13 (First Aired:
When Sheldon tries to prove his mental superiority as they train for the Physics Bowl, the guys kick him off the team and bring his nemesis (Sara Gilbert) aboard.
S01, E14 (First Aired:
Leonard and the guys buy a time machine prop from a classic movie; Penny tells the guys their obsession with comics and toys is pathetic.
S01, E15 (First Aired:
Leonard devises a plan to eliminate his rivals when he, Wolowitz and Koothrappali all fall for Sheldon's twin sister, but his plan backfires when Sheldon decides to choose who his sister dates.
S01, E16 (First Aired:
Penny learns that Leonard does not celebrate birthdays, so she plans a surprise party; Sheldon unexpectedly gets to live out one of his biggest fantasies in an electronics store.
S01, E17 (First Aired:
When Leonard finally works up the courage to ask Penny out on a date, they each turn to Sheldon for advice.
S02, E01 (First Aired:
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
S02, E02 (First Aired:
After seeing Penny with a handsome new guy, Leonard rushes into a rebound relationship with Sheldon's nemesis, Leslie Winkle.
S02, E04 (First Aired:
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S02, E05 (First Aired:
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S02, E06 (First Aired:
Sheldon and the gang are confused when a young grad student is attracted to him.
S02, E07 (First Aired:
When Sheldon bans Penny from the apartment for a series of petty infractions, Penny vows to get revenge.
S02, E08 (First Aired:
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
S09, E19 (First Aired:
Sheldon makes a surprise revelation when Amy buys him a new laptop; Leonard and Wolowitz get sold out by Koothrappali after lying to their wives to attend a movie screening.
S02, E09 (First Aired:
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
S02, E10 (First Aired:
Leonard asks Penny for advice when his new relationship starts moving too fast.
S02, E11 (First Aired:
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
S02, E12 (First Aired:
When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose their most important teammate in an upcoming fighting-robot competition.
S02, E13 (First Aired:
Sheldon develops a scientific procedure for making friends; Kripke controls a new supercomputer.
S02, E14 (First Aired:
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.