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, 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.
S09, E01 (First Aired:
Sheldon struggles to understand what is going on with Amy; Penny must decide if she can get past Leonard's bad behavior.
S09, E02 (First Aired:
Leonard tries to ease Penny's mind; Sheldon plans a special episode of ``Fun With Flags''; Bernadette feels bad about keeping a secret.
S09, E03 (First Aired:
A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills; Penny is compelled to tell her family that she and Leonard eloped.
S10, E04 (First Aired:
After her apartment floods, Amy suggests that she and Sheldon move in together; Koothrappali finds out the gender of Howard and Bernadette's baby before they do.
S09, E05 (First Aired:
Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.
S09, E06 (First Aired:
Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to to find Amy a new man on a dating app.
S09, E07 (First Aired:
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.
S09, E08 (First Aired:
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.
S09, E04 (First Aired:
An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.
S09, E10 (First Aired:
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.
S09, E11 (First Aired:
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.
S09, E12 (First Aired:
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.
S09, E13 (First Aired:
After dealing with Sheldon while he was sick, Leonard, Penny and the gang attempt to treat themselves to a Sheldon-free weekend.
S09, E14 (First Aired:
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.
S09, E15 (First Aired:
Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Penny and Leonard wrestle with getting older; Howard and Bernadette make a discovery in their hot tub; Raj is torn between Emily and another woman.
S09, E16 (First Aired:
The gang celebrates news of Bernadette's pregnancy by singing karaoke; Wolowitz's reaction to the pregnancy announcement worries Bernadette; Wolowitz believes he needs to make more money to support his growing family.
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.
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.
S10, E02 (First Aired:
Wolowitz has a meeting with Colonel Williams, a representative from the Air Force Department of Material Command.
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.
S09, E20 (First Aired:
Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Koothrappali goes all out with pregnancy gifts.
S09, E21 (First Aired:
During a group get-together, a minor argument between Sheldon and Leonard turns into a heated debate, leaving the rest of the gang to choose sides.
S09, E22 (First Aired:
The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.
S09, E23 (First Aired:
Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.
S09, E24 (First Aired:
Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.
S01, E01 (First Aired:
Leonard is happy to meet new neighbor Penny, but his roommate thinks he is chasing an impossible dream.
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).
No Episode Title
A free-spirited beauty moves in next door to two physicists.
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.