Season 1, Episode 1: Pilot24 September 2007
A pair of brilliant theoretical physicists meet a woman who shows them how little they know about the real world.
1 October 2007
Penny is furious and more than a little freaked out with Leonard and Sheldon when they sneak into her apartment overnight, and clean it while she is sleeping.
8 October 2007
Leonard gets upset when he discovers that Penny is seeing a new guy, so he tries to trick her into going on a date with him.
15 October 2007
Sheldon's Christian-fundamentalist mother visits to get him out of the funk he's in after he is fired for being disrespectful toward his new boss.
22 October 2007
Leonard and his colleague Leslie spend the night together. But Leslie tells Leonard after the fact that she's only interested in a one-night stand.
29 October 2007
The guys are invited to Penny's Halloween costume party. During the party, Leonard has a run-in with Penny's ex-boyfriend.
5 November 2007
When Howard hooks up with Penny's old friend, it ruins the nights on which all of the guys play the game "Halo."
12 November 2007
Rajesh's parents, communicating from India by Web cam, arrange for him to go out with another Indian woman in the hopes of marriage, but his date turns out to have more in common with Sheldon.
17 March 2008
Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics convention, but Sheldon does not.
24 March 2008
Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too many loose ends, so he comes up with a new, unnecessarily complex one to replace it.
31 March 2008
Sheldon is sick, and Leonard and the guys sneak out to a "Planet of the Apes" movie marathon to get out of taking care of him--which leaves Penny as the only person to whom the needy Sheldon can turn.
14 April 2008
Sheldon is threatened when a new 15-year-old prodigy who is smarter than him joins the lab, so the guys come up with a plan to get rid of him.
21 April 2008
Sheldon becomes so intent on demonstrating his intellectual superiority over his Physics Bowl teammates that they boot him, and replace him with his nemesis.
28 April 2008
Penny gets mad at Leonard because the guys' new "time machine" causes her to miss work. Leonard is so devastated that he vows to give up all of his nerd memorabilia.
5 May 2008
Sheldon's sexy twin sister arrives in town from Texas, and all of Sheldon's friends fight over who will get to be with her.
12 May 2008
When Penny and the guys learn that Leonard has never had a birthday party, they decide to try to throw a surprise party for him.
19 May 2008
After Penny breaks up with her new guy, she agrees to go out on a date with Leonard. However, both of them have reservations about the date soon after agreeing to it.
22 September 2008
Leonard is concerned when his date with Penny ends abruptly and she starts blowing him off. When told the truth, Sheldon would rather move out than keep Penny's reasons a secret from Leonard.
29 September 2008
After seeing Penny with her new boyfriend, Leonard turns to Leslie for comfort. The move angers Sheldon, who considers Leslie his comic book-style "arch enemy."
6 October 2008
Sheldon turns Penny on to online gaming, and then she refuses to turn it off after becoming addicted.
13 October 2008
After being featured in a People magazine article, Raj becomes full of himself and alienates his friends. However, his newfound fame does get him a date with Penny.
20 October 2008
The gang tries to teach Sheldon how to drive.
3 November 2008
Sheldon becomes cozy with a female graduate student who is infatuated with him, but nobody can figure out whether they're in a relationship--including Sheldon.
10 November 2008
Penny plans revenge when Sheldon bans her from the guys' apartment, while Howard and Rajesh use the latest technology to try to find the house being used in "America's Next Top Model."
17 November 2008
Howard and Leonard's friendship could be at an end when Leonard steals Howard's new woman from him.
24 November 2008
Sheldon tries to help move Leonard's new relationship along, because his track record with women has been less than successful. But will he cause more trouble than good?
8 December 2008
Leonard is the last one to realize that Stephanie has moved in with him. And when he finds out, he becomes worried that they are moving too fast
15 December 2008
Much to Lenonard's disappointment, Penny suddenly develops an interest in science when a sexy new physicist joins the lab. Meanwhile, Sheldon struggles to find an appropriate Christmas gift for Penny.
12 January 2009
Howard becomes depressed after Penny makes a cruel statement about his love life, while the rest of the guys prepare for a grudge killer robot duel against an obnoxious colleague at the university.
19 January 2009
Sheldon tries to make friends with a despised colleague, with the hopes that it will get him access to a coveted computer in the lab.
2 February 2009
Penny cannot afford to pay her rent, so Sheldon and Leonard each come up with unique ways to help her out.
9 February 2009
Sheldon hits it off with Leonard's psychoanalyst mother, but she drives Leonard and Penny to the bottle.
2 March 2009
Howard hooks up with Leslie, while Penny accidentally ruins Sheldon's spot on the couch.
9 March 2009
On a train trip to San Francisco, the boys debate on how to meet sci-fi star Summer Glau, who is on board with them.
16 March 2009
Sheldon's assistance with Penny's home-based business leads to disaster.
30 March 2009
Penny becomes jealous when a gorgeous new neighbor attracts the guys' attention.
13 April 2009
Leonard is so upset when a friend from the comic book store begins dating Penny that he convinces Howard and Raj to take him to a bar so that he can pick up a woman of his own.
27 April 2009
After being dumped by Leslie, Howard heads to Las Vegas with Leonard and Raj, leaving Penny to deal with Sheldon, who has locked himself out of the apartment.
4 May 2009
Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his NASA projects.
11 May 2009
Penny gets upset when she finds out Leonard and the guys plan to work at the North Pole for the summer.
21 September 2009
After returning from the North Pole, a conflict among the guys sends Sheldon back to Texas and interferes with Leonard's reunion with Penny.
28 September 2009
Leonard and Penny's first night together goes awkwardly. Sheldon and Howard wager on the species of a cricket.
5 October 2009
Sheldon attempts to covertly alter Penny's habits, while Howard and Raj try their luck meeting women at a Goth-style club.
12 October 2009
Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.
19 October 2009
Wolowitz begs Penny to set him up with one of her friends; Sheldon seeks payback against Wil Wheaton.
2 November 2009
To blend in better with several of Penny's friends from back home, Leonard learns about football...from Sheldon. Meanwhile, a loss in a kite war threatens to end Raj and Howard's friendship.
9 November 2009
Sheldon is forced to play peacemaker when Leonard and Penny have an argument, mainly because their fighting is bringing back repressed childhood memories.
16 November 2009
Penny separates her shoulder in the bathtub, and is forced to turn to Sheldon for help. Meanwhile, the rest of the guys accidentally get stoned in the desert while waiting for a meteor shower
23 November 2009
Sheldon vows payback after Kripke humiliates him on the radio. Howard gets advice concerning his relationship with Bernadette...from "Battlestar Galactica's" Katee Sackhoff.
7 December 2009
Sheldon attempts to help Penny understand physics to impress Leonard, and Wolowitz becomes jealous when his new girlfriend takes an interest in Leonard's research.
14 December 2009
Leonard's mother makes a visit to his dismay and Sheldon's delight.
11 January 2010
Raj talks Sheldon into being his wingman at a university mixer. Leonard has trouble dealing with Penny consulting a psychic.
18 January 2010
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
1 February 2010
Sheldon acts even more strangely when he is stumped by a difficult physics question, so he is forced to resort to Einstein-inspired measures to unclutter his mind and solve the problem.
8 February 2010
When Leonard must travel to Switzerland on Valentine's Day to visit the CERN laboratory, Sheldon uses any and all means to be his guest instead of Penny.
1 March 2010
Sheldon misses an opportunity to get Stan Lee's autograph because he has to make an appearance in traffic court.
8 March 2010
When the guys find an actual ring from the "Lord of the Rings" trilogy at a garage sale, their friendship is threatened.
22 March 2010
Sheldon needs the gang's help in overcoming his fear of public speaking when he receives an award.
12 April 2010
Sheldon takes on his newest nemesis, Star Trek's Wil Wheaton, in bowling. Leonard and Penny's relationship comes to a crossroad.
3 May 2010
With Leonard and Penny now broken up, Sheldon is forced to go behind Leonard's back to spend time with her.
10 May 2010
Sheldon and Penny are both disturbed and disappointed when Leonard hooks up with Sheldon's visiting female physicist friend.
17 May 2010
After Leonard and Sheldon get in a fight over the thermostat, Leonard goes to Penny's apartment and tells her about how he met Sheldon for the first time and how they became roommates...and what happened to the elevator.
24 May 2010
Penny has a night of angry, drunken sex with Leonard, which Leonard soon misinterprets as something other than a mistake. Meanwhile, Wolowitz and Koothrappali search for Sheldon's perfect match online.
23 September 2010
Penny ends up tagging along on Sheldon's first-ever date with Amy Farrah Fowler, while Wolowitz finds an unusual use for the new robotic arm he's created.
30 September 2010
When Sheldon calculates the technology to download his consciousness into a robot won't be invented soon enough, he desperately tries to find a way to increase his lifespan.
7 October 2010
Following his breakup with Amy, the gang becomes concerned with Sheldon's obsessive search for non-human companionship, and they call his mother to intervene.
14 October 2010
Wolowitz tries to get help in winning back Bernadette, but he has to confess to Penny the embarrassing reason they broke up in the first place. Raj demands that Sheldon allow him to put a desk in their office.
21 October 2010
Sheldon is scared that he is in a relationship when Amy asks him to meet her mother, and Leonard asks Wolowitz and Bernadette to set him up because he is the only person in the group without a girlfriend.
28 October 2010
Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and concocts an elaborate story to help him keep the secret from Raj.
4 November 2010
An FBI agent interviews everyone when Howard needs to obtain a security clearance. Sheldon is beside himself when Howard refuses to accept his apology.
11 November 2010
The guys camp out all night waiting to see a new movie while Penny and Bernadette invite Amy to her first slumber party.
18 November 2010
Penny asks Leonard to pose as her boyfriend when her father visits. Howard, Raj, and Bernadette are up all night looking through a telescope.
9 December 2010
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
16 December 2010
The guys enter a costume contest as members of the Justice League...and convince Penny's new boyfriend to join them.
6 January 2011
Leonard has an idea for a new smartphone app and asks the guys for help. However, Sheldon tries to take over the project, and Leonard fires him.
20 January 2011
Tension runs high as the entire gang spends the weekend together at a science convention.
3 February 2011
To improve his skills as an instructor, Sheldon asks Penny to give him acting lessons. Meanwhile, Raj begins having impure fantasies about Bernadette.
10 February 2011
To secure needed funding for their school, Sheldon convinces Leonard to get friendly with a wealthy benefactor.
17 February 2011
Bernadette makes Howard choose between herself and his mother, and how will Penny react when Leonard begins seeing Raj's sister again when she's back in town?
24 February 2011
Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
10 March 2011
Priya forces Leonard to choose between a relationship with her or a friendship with Penny. A magic trick by Howard has Sheldon fooled.
31 March 2011
The gang goes all out to help Sheldon find the person responsible for hacking his online gaming account, but Priya is beginning to get fed up with Leonard's childish behavior.
7 April 2011
Sheldon and Amy secretly experiment on the gang by spreading rumors. Howard and Bernadette's relationship reaches an important milestone.
28 April 2011
When Priya finds a loophole in the roommate agreement to throw Sheldon out for the night, Penny, Amy, and Bernadette take Sheldon to a nightclub.
5 May 2011
While Sheldon invents a three-player chess game, Bernadette uses a double date to spy on Leonard and Priya's relationship, and Raj tries a new drug to treat his social anxiety.
12 May 2011
Howard believes that his mom suffered a heart attack because he told her that he's marrying Bernadette, and Sheldon freaks out over germs after he accidentally drinks Leonard's water.
19 May 2011
Raj moves in with Sheldon after hearing Leonard and Priya engage in a Star Trek fantasy in his apartment. Bernadette receives her doctorate, and the gang teases Howard about not having one.
22 September 2011
The gang deals with the fallout from Penny and Raj's night together. Amy counsels Penny when she considers moving back to Nebraska due to her failing acting career. Sheldon takes charge of the paintball team.
22 September 2011
Sheldon has health issues with Penny's new chair. Amy gets inadvertently caught in the middle of a fight between Sheldon and Penny. Leonard tries to add some spice to his long-distance relationship with Priya.
29 September 2011
While Sheldon stays at home to play with his new train set, Leonard and Amy learn a lot about each other when he goes as her "plus one" to a wedding. Howard and Bernadette spend the weekend with his mother.
6 October 2011
Penny sets up Raj with a deaf friend, not knowing that she's actually a gold digger, and Sheldon decides to let his minor decisions rest on the roll of the dice.
13 October 2011
Sheldon takes offense when Leonard wants to attend a party with Star Trek's Wil Wheaton and Brent Spiner, and Bernadette tries to block Howard's opportunity to go into outer space.
20 October 2011
Sheldon is upset when his mom comes to visit but refuses to cook for him and attend physics lectures.
27 October 2011
Sheldon tries to get into the spirit of Halloween by trying to scare the guys after they prank him. A comic book artist is interested in Leonard.
3 November 2011
Amy is hurt when Bernadette and Penny goes bridesmaid dress shopping without her, so she turns to a reluctant Sheldon for comfort.
10 November 2011
Sheldon must overcome his fear of birds while Leonard and Penny attempt to hang out together strictly as friends.
17 November 2011
When Stuart from the comic book store asks Amy on a date, Sheldon considers having a more serious relationship with her. Meanwhile, the guys become obsessed with a new card game involving Wild West heroes and witches.
8 December 2011
Leonard must confront the man who bullied him in high school, while Penny realizes she did her fair share of tormenting in the past.
12 January 2012
Penny must help Sheldon work on his relationship with Amy when he trivializes one of her accomplishments. Bernadette's dislike of children bothers Howard.
19 January 2012
Leonard and Penny contemplate reviving their romantic relationship. Sheldon's attempt to order Star Trek memorabilia doesn't go as planned.
26 January 2012
Leonard and Penny develop a system to insure their dates go smoothly. Raj finally finds a woman he can talk to - the virtual assistant on his mobile phone.
2 February 2012
Leonard signs out of his roommate agreement, reducing himself and Sheldon to mere acquaintances, while Howard tries to think of a cool astronaut nickname for himself.
9 February 2012
When the university forces Sheldon to use vacation days, he decides to hang out in Amy's lab. Bernadette wants Howard to sign a prenuptial agreement.
16 February 2012
Sheldon battles Barry Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.
23 February 2012
Sheldon wreaks havoc when he tries to get a haircut from his regular barber, who is ill. Howard runs into a few problems with astronaut training.
8 March 2012
Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.
29 March 2012
Raj gets quite a surprise when he asks his parents to set him up on a date. Penny buys Leonard and Sheldon a pair of Star Trek keepsake collectibles, not knowing the effect it would have on Sheldon.
5 April 2012
Sheldon uses any and all means to meet his hero, Dr. Stephen Hawking.
26 April 2012
The guys throw Howard a bachelor party, and some embarrassing details about his life get posted on the Internet.
3 May 2012
Howard faces double trouble when NASA moves up his launch and he has to meet Bernadette's father. Some awkward pillow talk by Leonard may change his relationship with Penny.
10 May 2012
The gang scrambles to provide Howard and Bernadette a wedding before Howard's mission into space.
27 September 2012
When Sheldon is required by the Relationship Agreement to take Amy out for their second anniversary, he asks Raj to tag along. Leonard has difficulty being with Penny and not asking where their relationship is heading.
4 October 2012
The gang wants Penny to tell Leonard how she feels about him. Howard is the target of practical jokes on the space station. Raj and Stuart plan to go out on the town.
11 October 2012
When Sheldon hires a female grad student to assist him, a jealous Amy asks Penny to help her spy on them, only to make a shocking discovery. Life in the International Space Station is wearing on Howard.
18 October 2012
Howard is offended when his return from space is met with little fanfare but he gets an even bigger surprise at home. Game Night turns into a battle royale between Penny and Sheldon.
25 October 2012
When the gang celebrates Halloween at Stuart's comic book store, Leonard uses his scientific knowledge to seduce Penny.
1 November 2012
Penny enrolls in a college class and keeps it a secret from Leonard. Sheldon causes conflict with Dr. Stephen Hawking over an online game.
8 November 2012
Wolowitz must make a decision whether or not to move out of his mother's house, and Sheldon is caught in the middle of an argument between Amy and Wil Wheaton.
15 November 2012
Leonard is surprised to learn about Penny's study partner at school, and Howard and Raj are determined to find out about one of Sheldon's secrets.
29 November 2012
The gang is drawn into a fight between Howard and Sheldon over Sheldon's vacant parking spot.
6 December 2012
Howard tries to bond with Bernadette's father during a fishing trip. When Sheldon is obligated to take care of a sick Amy, she finds ways to take advantage of the situation.
13 December 2012
The ladies take Raj out to a nightclub to find him a date. A game of Dungeons and Dragons rekindle old memories of Santa for Sheldon.
3 January 2013
Penny finds out that Sheldon's assistant is hitting on Leonard, and Sheldon gets himself and his friends in trouble with Human Resources trying to solve the problem.
10 January 2013
The guys are stranded in the middle of nowhere when Leonard's car is stolen on the way to the Bakersfield Comic-Con. Back home, the women try to figure out why the guys are so fascinated with comic books.
31 January 2013
Sheldon is forced to work with Barry Kripke on a project and must concoct an elaborate lie when he can't hold up his end of the work. Howard and Raj get superhero figurines made of themselves.
7 February 2013
Leonard moves in with Penny after a fight with Sheldon, which causes Amy to want to move in with Sheldon. Meanwhile, Raj has a frightening experience with Howard's mom.
14 February 2013
Sheldon tasks his assistant to buy a Valentine's Day gift for Amy. Leonard, Penny, Howard, and Bernadette have a disastrous dinner together, while Raj and Stuart host a "Lonely People" party at the comic book store.
21 February 2013
Raj falls apart after his date sneaks out on him, and Sheldon reluctantly returns the favor after Penny helps him out with his "Fun With Flags" program.
7 March 2013
Raj devises a date for Lucy that fixes their social anxiety problems. Leonard, Sheldon, and Howard give lectures on science to junior high students. Penny, Amy, and Bernadette ditch work to go to Disneyland.
14 March 2013
Penny and Leonard host a cocktail party. Howard receives a letter from his father, whom he hasn't heard from since he was 11.
4 April 2013
Leonard, Sheldon, and Raj battle for tenure at the university and drag the ladies into the fight.
25 April 2013
Sheldon falls apart when one of his favorite TV shows is canceled and Amy must help him through it. Raj finds out a secret about Lucy.
2 May 2013
Bernadette and Howard offer to watch Raj's dog and live to regret it. Leonard and Sheldon hire their favorite childhood star, Professor Proton (Bob Newhart), to make an appearance.
9 May 2013
A date between Raj and Lucy takes both of them out of their comfort zones. After a trip to Las Vegas goes awry, the ladies join in on a Dungeons & Dragons game, which causes Amy and Sheldon to reevaluate their relationship.
16 May 2013
In the Season 6 finale, Penny is thrown for a loop when Leonard is offered a job overseas, but the news is an even bigger shock to Sheldon. Raj wants more out of his relationship with Lucy than she can handle.
26 September 2013
Sheldon and Penny bond over missing Leonard. Howard tries to help Raj get over his breakup with Lucy. Amy and Bernadette take a trip together to a biology convention.
26 September 2013
Sheldon feels betrayed when Leonard returns from the North Sea and wants to spend his time with Penny instead of him. Howard's latest foray into helping his mother has some disastrous side effects.
3 October 2013
After the gang blows off Raj's mystery dinner, he creates a scavenger hunt, with unusual pairings. Amy and Howard bond over their love of Neil Diamond, while Bernadette gets competitive.
10 October 2013
Sheldon gets mad at Amy for ruining one of his favorite movies. Raj & Stuart try to make their online dating profiles more appealing, and Leonard tries to play the sympathy card with Penny.
17 October 2013
After a fight with Bernadette, Howard ends up on Raj's couch. Sheldon must balance work and social time when Amy takes a job at the university.
24 October 2013
Howard tries to do something special to celebrate the anniversary of his first date with Bernadette. Sheldon is conflicted when he makes a major scientific breakthrough but some details have to be corrected.
7 November 2013
Sheldon seeks payback when Arthur "Professor Proton" Jeffries (Bob Newhart) asks Leonard for help on a project instead of him. Raj gets upset at Howard for crashing his night out with the ladies.
14 November 2013
Sheldon demands Leonard make up for a mistake from their past. Penny confronts Raj's ex-girlfriend, Lucy.
21 November 2013
The gang spends Thanksgiving at Mrs. Wolowitz's house. Howard tries to bond with his father-in-law, and a mistake from Penny's past comes back to haunt her.
5 December 2013
Leonard has to deal with the fallout of disproving Sheldon's new scientific discovery. Raj spends a week at Howard's and Bernadette's apartment.
12 December 2013
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