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, 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.
S02, E15 (First Aired:
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother (Christine Baranski).
S02, E16 (First Aired:
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S02, E17 (First Aired:
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is aboard the train they are taking to San Francisco.
S02, E18 (First Aired:
Penny's home business turns into a complete nightmare when Sheldon takes over.
S02, E19 (First Aired:
Penny develops a rivalry with a sexy new female neighbor who threatens her position as queen bee of the building.
S02, E21 (First Aired:
Koothrappali and Leonard take Wolowitz to Las Vegas; Sheldon is forced to bunk with Penny when he gets locked out of his apartment.
S02, E22 (First Aired:
Penny makes a surprising revelation about Leonard while on her date with Stuart; Wolowitz finds a critical design flaw in his NASA project.
S02, E23 (First Aired:
While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.
S03, E01 (First Aired:
After tampering with Sheldon's Arctic-expedition data, the guys follow him back to Texas, which threatens Leonard's chances for romance with Penny.
S03, E02 (First Aired:
Penny and Leonard try to recover from an awkward hookup; Howard and Sheldon make a high-stakes bet.
S03, E03 (First Aired:
Howard and Raj hit a Goth nightclub to meet women; Sheldon tries chocolate-based behavior modification on Penny.