The Big Bang Theory Episode Rating Graph
Sep 2007 - May 2019
Sep 2007 - May 2019
7.9
Browse episode ratings trends for The Big Bang Theory. Simply click on the interactive rating graph to explore the best and worst of The Big Bang Theory's 279 episodes.
S12 Ep24
8.5
16th May 2019
Johnny Galecki and Kaley Cuoco will lead fans on a trip down memory lane, sharing some of the best-kept backstage secrets and personal memories from the past 12 years.
S2 Ep11
8.3
15th Dec 2008
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
S12 Ep23
8.3
16th May 2019
Sheldon and Amy await big news. Meanwhile, Penny and Leonard have some big news of their own. Also, Howard and Bernadette face the stressful challenge of leaving their kids for the first time and Raj makes a new friend, as the gang travels together into an uncharted future.
S7 Ep9
8.3
21st Nov 2013
Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.
S5 Ep24
8.3
10th May 2012
The fifth season ends with Howard and Bernadette deciding to get married before his NASA mission, causing the gang to scurry into overdrive in an effort to stage the wedding. NASA astronaut Mike Massimino has a cameo as himself.
S7 Ep3
8.2
3rd Oct 2013
When the entire gang competes in a scavenger hunt designed by Raj, it brings out the best - and worst - in everyone.
S4 Ep24
8.2
19th May 2011
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.
S3 Ep23
8.2
24th May 2010
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.
S5 Ep7
8.2
27th Oct 2011
A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.
S7 Ep6
8.2
24th Oct 2013
Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.
S10 Ep24
8.2
11th May 2017
The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.
S6 Ep21
8.2
25th Apr 2013
Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.
S9 Ep11
8.2
17th Dec 2015
After more than five years of dating, Sheldon and Amy spend their first night together. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket.
S5 Ep21
8.2
5th Apr 2012
When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
S6 Ep23
8.2
9th 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 girls join in on a Dungeons and Dragons game, which causes Amy and Sheldon to re-evaluate their relationship.
S11 Ep24
8.2
10th May 2018
When Amy's parents and Sheldon's family arrive, everybody is focused to make sure all wedding arrangements go according to plan – everyone except the bride and groom.
S5 Ep14
8.2
26th Jan 2012
Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a "woman" he can talk to without being drunk, in the form of Siri on his new phone. Meanwhile, Sheldon decides to start a YouTube series entitled "Sheldon Cooper presents Fun with Flags" with the help of Amy.
S3 Ep22
8.2
17th May 2010
Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
S6 Ep20
8.1
4th Apr 2013
The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.
S5 Ep23
8.1
3rd May 2012
When NASA moves up Howard's mission, he must face his fears and Bernadette's dad, thus putting the wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.
S7 Ep19
8.1
3rd Apr 2014
While Raj is wracked with guilt when he tries to date two women at once, Penny wrestles with whether to take a role in a cheesy movie and Sheldon is torn trying to choose between two gaming systems.
S6 Ep10
8.1
6th Dec 2012
When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.
S5 Ep18
8.1
23rd Feb 2012
Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes Howard to reconsider wanting to go into space. Penny beats Leonard in chess, the first time she plays.
S4 Ep18
8.1
10th Mar 2011
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
S1 Ep17
8.1
19th May 2008
Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.
S4 Ep20
8.1
7th Apr 2011
Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.
S3 Ep8
8.1
16th Nov 2009
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
S6 Ep19
8.1
14th Mar 2013
Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.
S5 Ep19
8.1
8th Mar 2012
Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.
S4 Ep11
8.1
16th Dec 2010
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
S7 Ep15
8.1
6th Feb 2014
Sheldon and Amy take a train ride to Napa Valley with Howard and Bernadette on Valentine's Day. Leonard and Penny take Raj's dog to the vet when she accidentally eats some chocolate.
S6 Ep12
8.1
3rd Jan 2013
When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Howard in trouble.
S6 Ep13
8.1
10th Jan 2013
As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.
S5 Ep20
8.1
29th Mar 2012
Penny buys Leonard and Sheldon “Star Trek” collectibles as a thank-you, leading Sheldon to be haunted by Mr. Spock. Meanwhile, Raj decides he has met the “Future Mrs. Koothrappali” after his parents set him up on a date.
S4 Ep9
8.1
18th Nov 2010
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
S5 Ep13
8.1
19th Jan 2012
Leonard, who broke up with Priya, asks Penny out to a spur-of the-moment romantic dinner for two, and the duo contemplates on their relationship.
S6 Ep24
8.1
16th May 2013
When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop. Raj and Lucy's relationship comes to a crossroad.
S3 Ep18
8.1
22nd Mar 2010
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
S2 Ep15
8.1
9th Feb 2009
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
S6 Ep8
8.1
15th Nov 2012
Raj and Howard try to to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.
S7 Ep11
8.1
12th Dec 2013
While Sheldon is at home in Texas, the rest of the gang realizes how much he has changed their lives as they decorate the apartment Christmas tree.
S4 Ep23
8.1
12th May 2011
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
S2 Ep7
8.1
10th Nov 2008
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
S6 Ep9
8.1
29th Nov 2012
When the University reassigns Sheldon’s parking spot to Wolowitz, their fight affects the whole gang.
S7 Ep2
8.1
26th Sep 2013
Leonard and Sheldon's friendship is tested; Howard's latest foray into helping his mother has some disastrous side effects.
S7 Ep24
8.0
15th May 2014
Sheldon get upset about his career, the destruction of the comic book store and Leonard and Penny's future living arrangements. Howard and Bernadette can't keep hold of a caretaker for his mother. With his entire world changing around him, Sheldon considers a major move.
S5 Ep17
8.0
16th Feb 2012
Sheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.
S2 Ep3
8.0
6th Oct 2008
Sheldon creates a monster when he introduces Penny to online gaming.
S4 Ep21
8.0
28th Apr 2011
When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement. However, before he can get too far, Priya uses her skills as a lawyer to nullify the charges due to the agreement's vague wording, much to Sheldon's dismay. When the guys take advantage of Priya's skills in order to eat Greek food on pizza night, Sheldon goes to Penny, who invites him to a girls' night out with Amy and Bernadette, which Sheldon agrees to after Penny mentions that they may be talking trash about Priya. After the girls drink some cocktails, they decide to take Sheldon dancing, which Sheldon reluctantly goes along with. After dancing, Sheldon takes an intoxicated Amy back to her apartment and as well as talking about Priya, meets a monkey who is addicted to smoking cigarettes. Amy tells Sheldon not to give in to Priya's law skills, before kissing him and going to her bathroom to vomit.
S6 Ep4
8.0
18th Oct 2012
When Wolowitz returns from space, he doesn’t get the hero’s welcome he expected. Meanwhile, Game Night turns into a battle of the sexes.
S3 Ep14
8.0
1st Feb 2010
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
S5 Ep22
8.0
26th Apr 2012
After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.
S4 Ep1
8.0
23rd Sep 2010
Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
S5 Ep5
8.0
13th Oct 2011
Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity.
S6 Ep15
8.0
7th Feb 2013
A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.
S4 Ep19
8.0
31st Mar 2011
Sheldon's online-game account is hacked by Todd Zarnecki, who then proceeds to steal all his items prompting the guys to go on a quest to retrieve them. Penny, Bernadette and Amy discuss how Penny groomed Leonard to be willing to try various things and more adventurous boyfriend... for some other woman — Priya.
S7 Ep23
8.0
8th May 2014
A bad day causes Penny to reevaluate her life choices – including Leonard. Meanwhile, Howard and Bernadette struggle to care for Mrs. Wolowitz, and Raj gets relationship advice from Sheldon.
S4 Ep13
8.0
20th Jan 2011
Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
S5 Ep9
8.0
10th Nov 2011
Leonard and Penny try hanging out as friends on a 'non-date', but end up purposely ruining each others chances with perspective dates. Meanwhile, Sheldon enlists the help of Bernadette and Amy to overcome his fear of birds.
S1 Ep16
8.0
12th May 2008
Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
S7 Ep7
8.0
7th Nov 2013
Sheldon seeks payback when Arthur "Professor Proton" Jeffries asks Leonard for help on a project instead of him. Raj gets upset at Howard for crashing his night with the girls.
S1 Ep1
8.0
24th Sep 2007
Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
S5 Ep15
8.0
2nd Feb 2012
Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
S6 Ep22
8.0
2nd May 2013
Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.
S3 Ep21
8.0
10th May 2010
Leonard and Sheldon compete for the attention of a famous female physicist.
S3 Ep17
8.0
8th Mar 2010
When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
S5 Ep1
8.0
22nd Sep 2011
Penny is worried with how damaged her friendship with the guys will be in the aftermath of her sleeping with Raj while Sheldon becomes the leader of the paintball team.
S2 Ep23
8.0
11th May 2009
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
S2 Ep22
8.0
4th May 2009
Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.
S5 Ep10
8.0
17th Nov 2011
When Stuart asks Amy out on a date, Sheldon must confront his feelings and consider where his relationship with Amy is going.
S6 Ep18
8.0
7th Mar 2013
Leonard, Sheldon and Howard give lectures on science to junior high students. The girls ditch work to go to Disneyland. Raj devises a date for Lucy that fixes their social anxiety problems.
S6 Ep5
8.0
25th Oct 2012
The gang celebrates Halloween at Stuart’s comic book store. Meanwhile, Leonard seduces Penny with science.
S1 Ep2
8.0
1st Oct 2007
Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.
S7 Ep20
8.0
10th Apr 2014
Sheldon faces a personal crisis after deciding he’s wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.
S3 Ep10
8.0
7th Dec 2009
Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
S7 Ep4
8.0
10th Oct 2013
Sheldon gets mad at Amy for ruining one of his favorite movies, Raj and Stuart try to make their online dating profiles more appealing, and Leonard tries to play the sympathy card with Penny.
S5 Ep12
8.0
12th Jan 2012
Sheldon gets in trouble with Amy when he isn't impressed by her recent accomplishment, and Howard must come to grips with Bernadette's dislike of children.
S6 Ep3
8.0
11th Oct 2012
Amy feels threatened when Sheldon hires a young female assistant, and the pressure of being in space takes its toll on Wolowitz.
S1 Ep6
8.0
29th Oct 2007
Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
S5 Ep2
8.0
22nd Sep 2011
A fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.
S2 Ep6
8.0
3rd Nov 2008
Sheldon and the gang are confused when a young grad student is attracted to him.
S3 Ep20
8.0
3rd May 2010
When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
S6 Ep14
8.0
31st Jan 2013
Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.
S4 Ep22
8.0
5th May 2011
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
S12 Ep19
7.4
18th Apr 2019
The concept of what it would mean for women everywhere if Amy were to win a Nobel Prize causes Amy to have a meltdown. Also, Howard and Raj try to relive the good old days after Howard buys a scooter that looks like the one he had years ago.
S12 Ep5
7.4
18th Oct 2018
When Amy doesn’t have time to work on super-asymmetry, Sheldon goes to great lengths to ensure she’s available to work with him even it if means accidentally sabotaging her career in the process. Raj doesn’t want Howard to join him in hosting a show at the planetarium.
S12 Ep20
7.4
25th Apr 2019
Raj is worried people won’t take him seriously in his own field after publishing a paper that suggests he may have discovered alien life. Also, Leonard wants to be the principal investigator on a plasma physics study.
S12 Ep4
7.4
11th Oct 2018
When Sheldon won't tell anyone why he's never mentioned his childhood best friend, Leonard takes matters into his own hands. Bernadette and Penny take out Raj’s fiancée for dinner to get the skinny on her.
S8 Ep21
7.4
16th Apr 2015
When Raj is asked to create a message in case a NASA mission discovers alien life, the guys fight over what he should do. Also, Penny is torn between auditioning for a movie or keeping her successful pharmaceutical sales job.
S9 Ep6
7.5
26th Oct 2015
In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.
S11 Ep13
7.5
11th Jan 2018
When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Also, Bert the geologist replaces Wolowitz in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.
S9 Ep1
7.5
21st Sep 2015
After driving to Vegas to get married, Penny struggles with Leonard’s confession that he kissed another girl. Also, Sheldon doesn't know how to act after Amy pushes pause on their relationship.
S12 Ep18
7.5
4th Apr 2019
When competitors Pemberton and Campbell charm America on a publicity tour, Sheldon and Amy try to bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side. Also, Halley's fear of the dark causes opportunity and conflict at the Wolowitz home.
S10 Ep22
7.5
27th Apr 2017
Leonard isn’t thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack.
S12 Ep14
7.5
31st Jan 2019
Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law. Also, Leonard is disappointed when his friends exclude him from a scientific project.
S11 Ep18
7.5
29th Mar 2018
Bill Gates visits Penny's work, and the gang schemes to meet him. Hilarity ensues. Meanwhile, Sheldon is convinced that he's a target of an April's Fools prank.
S11 Ep17
7.5
8th Mar 2018
Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy. Also, Bernadette and Howard have a hard time deciding who should stay at home with the kids and who should go back to work.
S11 Ep14
7.5
18th Jan 2018
Raj finds himself in the middle of domestic drama when he learns the woman he's dating, has a very upset husband. Also, when Sheldon rents his old room back for a quiet place to work, he drives Leonard crazy by being a model tenant.
S12 Ep17
7.5
7th Mar 2019
When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is in charge of the kids. Also, Sheldon finds a book on experimenting on kids, and the guys plus Amy make a day of it.
S10 Ep19
7.5
30th Mar 2017
Leonard, Penny and Raj adjust to their new living arrangement, and Sheldon takes an interest in Amy’s work.
S8 Ep12
7.5
8th Jan 2015
Howard tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.
S12 Ep13
7.5
17th Jan 2019
Sheldon and Amy are thrilled when their super asymmetry theory is proven by two physicists, until they try to kick Amy off the Nobel nomination. Also, Bernadette gets one of her drugs approved at work and wants a reluctant Penny to head the sales team.
S8 Ep18
7.5
12th Mar 2015
Friction ensues when a magazine fails to mention Leonard in an article about the paper he co-wrote with Sheldon. Also, a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor.
S11 Ep11
7.5
14th Dec 2017
Raj and Howard's feud continues as the gang plan Halley's first birthday party. Sheldon's surprise for Amy's birthday goes awry when they get food poisoning. Also, Leonard gets a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.
S12 Ep9
7.5
15th Nov 2018
Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been theorized and disproven. Meanwhile, ultra-competitive Bernadette asks Stuart’s girlfriend to teach her how to beat Howard in a popular video game.
S11 Ep3
7.5
9th Oct 2017
Sheldon and Amy struggle with picking a wedding date, which stresses out Sheldon and causes him talking in his sleep. Meanwhile, Raj and Stuart fight over the attention of one of Bernadette's co-workers.
S11 Ep8
7.5
16th Nov 2017
Leonard and Howard are furious after they learn Sheldon went to work with the military behind their backs. Also, while Bernadette is on bed rest, she asks Raj to do some digging when she suspects that Ruchi might be trying to take over her projects at work.
S12 Ep21
7.5
2nd May 2019
Kripke has proof that Dr. Pemberton plagiarized his thesis in college, and Sheldon and Amy aren't sure if they should turn him in or not. Meanwhile, Howard learns that Bernadette wasn't the only waitress at the Cheesecake Factory who had a crush on him.
S12 Ep12
7.5
10th Jan 2019
Penny runs into her ex-boyfriend, Zack, who invites her and Leonard to a dinner to meet his newlywed wife. After the dinner the newlywed couple make an odd proposition to Leonard, which makes Penny to freak out. Also, Raj attempts to mend things with his ex-fiancée, Anu.
S11 Ep20
7.5
12th Apr 2018
A brilliant but reclusive scientist, Doctor Wolcott, invites Sheldon to his cabin in the middle of nowhere, and Leonard, Raj and Howard go along for the trip. Also, Penny and Bernadette improvise after Amy doesn’t like the tame bachelorette party they planned for her.
S10 Ep16
7.5
16th Feb 2017
Sheldon and Amy have their first fight since moving in together, and Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.
S10 Ep21
7.5
13th Apr 2017
Howard and Bernadette have a hard time leaving Halley in day care when Bernadette returns to work. Also, Bert introduces the gang to his new girlfriend, Rebecca.
S11 Ep16
7.5
1st Mar 2018
When Bernadette won't go into labor, the gang tries different tactics to get things started. Also, Howard confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.
S11 Ep4
7.5
16th Oct 2017
As Howard worries about fatherhood, he and Sheldon bond when they jointly assemble a model rocket. Meanwhile, Penny bonds with Leonard's mother, Beverly, much to his concern.
S11 Ep22
7.5
26th Apr 2018
Sheldon goes to Vegas to win money for science. Also, Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.
S9 Ep5
7.5
19th Oct 2015
The guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy. Also, when Stuart struggles to get female customers at the Comic Book Store, Penny, Amy and Bernadette come by to help him out.
S11 Ep6
7.5
2nd Nov 2017
Sheldon goes head-to-head with Wil Wheaton for the role of the new Professor Proton. Also, Penny steps in to take care of Halley when Bernadette and Howard both wind up on bed rest.
S12 Ep3
7.5
4th Oct 2018
The Wolowitzes' life gets complicated when Stuart starts bringing his new girlfriend home. Also, Penny and Leonard talk about starting a family, while Raj explores an arranged marriage.
S11 Ep2
7.5
2nd Oct 2017
Leonard angers the university – and the entire physics community – after he gives an embarrassing interview. Also, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.
S11 Ep12
7.6
4th Jan 2018
Sheldon and Amy try to pick their Best-Man and Maid of Honor by experimenting on the gang.
S12 Ep1
7.6
24th Sep 2018
Sheldon and Amy's honeymoon runs aground in New York. Penny and Leonard discover they are uncomfortably similar to Amy's parents. Raj insults physicist Neil deGrasse Tyson and starts a Twitter war.
S10 Ep23
7.6
4th May 2017
After Leonard, Sheldon and Wolowitz celebrate the completion of the top secret air force project, they are met with an unpleasant surprise. Also, Amy is offered a summer position as a visiting researcher.
S12 Ep11
7.6
3rd Jan 2019
Penny and Leonard organize a paintball game that results in mayhem when Sheldon is jealous of Amy. Also, Raj catches Anu with her ex-boyfriend, and Stuart gets cold feet when Denise hints at the possibility of them living together.
S10 Ep20
7.6
6th Apr 2017
Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as well as Amy on the same day. Also, Bernadette is nearing the end of her maternity leave and must return to work.
S10 Ep12
7.6
5th Jan 2017
Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.
S11 Ep19
7.6
5th Apr 2018
When Leonard learns Sheldon is the president of the tenants association, he decides to run against him. Also, Bernadette encourages Howard and Raj to find the owner of a drone after they find it in the backyard.
S9 Ep4
7.6
12th Oct 2015
Sheldon learns of an impending change in his living arrangements and decides to revert back to 2003, a simpler time before he met Leonard and Penny. Also, Howard and Raj form a band to play at the Comic Book Store.
S9 Ep12
7.6
7th Jan 2016
Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf. Also, Sheldon and Koothrappali collaborate on an astronomical discovery, and Wolowitz and Bernadette can't believe what they are feeling after Stuart moves out.
S10 Ep18
7.6
9th Mar 2017
When Raj moves out of his apartment, Leonard and Penny offer him Sheldon's old room.
S8 Ep13
7.6
29th Jan 2015
When Sheldon becomes stuck in a rut with his work, the gang tries to help him by raising his stress levels. Howard teases Raj with a game called "Emily or Cinnamon?"
S12 Ep7
7.6
1st Nov 2018
Leonard is caught between a rock and a hard place when he's responsible for distributing extra grant money. Bernadette turns the backyard playhouse into a hideaway from Howard and the kids.
S8 Ep10
7.6
20th Nov 2014
While Sheldon says a tearful goodbye to the final installment of "Fun with Flags", Leonard, Howard and Raj search for something significant in a dead professor's research. And Bernadette finds out what her colleagues really think of her.
S9 Ep2
7.6
28th Sep 2015
Leonard confronts the woman he kissed on the North Sea in an attempt to set Penny's mind at ease. Also, Sheldon films a special episode of "Fun with Flags" after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.
S8 Ep23
7.6
30th Apr 2015
Personalities collide when Sheldon and Leonard’s mothers finally meet. Meanwhile, Howard finally decides to “man up” and do his fair share of the housework – but not without a little help from his friends.
S11 Ep5
7.6
23rd Oct 2017
Sheldon and Raj confide in Bernadette when they can't handle Amy and Howard working together on a science project. Also, Penny and Leonard learn new tactics for how to deal with Sheldon from an unlikely source.
S9 Ep17
7.6
25th Feb 2016
After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.
S10 Ep13
7.6
19th Jan 2017
When Penny feels that Leonard is taking her for granted, she decides to go on a spa weekend with Amy. Also, Wolowitz and Koothrappali try to fix a squeaky floorboard in the baby’s room.
S11 Ep21
7.6
19th Apr 2018
Sheldon’s comic book store experiences changes when writer Neil Gaiman puts Stuart’s store on the map. Also, friendships are threatened when Raj takes credit for Penny's astronomical discovery.
S8 Ep22
7.6
23rd Apr 2015
Howard questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially.
S10 Ep10
7.6
1st Dec 2016
Sheldon and Leonard try to divvy up their shared belongings, but can’t agree on anything. Also, Koothrappali and Stuart fight to be the most helpful during Bernadette’s final weeks of pregnancy.
S10 Ep14
7.6
2nd Feb 2017
Sheldon beta-tests an MIT invention after hearing it can help him read people’s emotions. Also, Leonard can’t hide his feelings when Penny announces her brother is coming to town, and Raj invites his ex-girlfriends over to give him dating advice.
S12 Ep8
7.6
8th Nov 2018
Sheldon tries to bond with Amy's father, but when Howard lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Raj and Anu try to get physical for the first time.
S9 Ep15
7.6
11th Feb 2016
Sheldon and Amy host a live Valentine's Day episode of Fun with Flags, Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and the cute girl he met at the Comic Bookstore.
S11 Ep7
7.6
9th Nov 2017
Sheldon and Bert collaborate on a research project, despite Sheldon’s embarrassment. Also, Penny and Bernadette coach Raj on how to navigate his relationship with Ruchi.
S12 Ep15
7.6
7th Feb 2019
Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa. Also, Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip.
S11 Ep15
7.6
1st Feb 2018
Leonard's book raises questions, and Amy guest stars on the new Professor Proton show.
S9 Ep23
7.6
5th May 2016
Sheldon hires Stuart to spend the day with Amy when he’d rather go to a movie screening. Also, Leonard’s mother, Beverly, comes to town and Penny struggles to make a connection with her.
S9 Ep21
7.6
21st Apr 2016
Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together.
S10 Ep3
7.6
3rd Oct 2016
Tensions rise when the boys struggle to complete their government project on time and Sheldon tries an energy drink to stay awake. Also, Penny and Amy go to a “party” at Bert the geologist’s house, and Koothrappali learns Bernadette’s true feelings about her pregnancy when they clean out the future baby room.
S9 Ep13
7.6
14th Jan 2016
After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.
S8 Ep19
7.6
2nd Apr 2015
When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Doctor Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong.
S8 Ep20
7.6
9th Apr 2015
When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Howard meets the half-brother he never knew he had. Meanwhile, Penny is invited to appear on Wil Wheaton’s podcast, but things turn awkward when Leonard joins them.
S11 Ep23
7.6
3rd May 2018
When Sheldon learns that his mother won’t attend his wedding unless he invites his brother, Georgie, he and Leonard travel to Texas to end a family feud. Also, the Wolowitz kids inadvertently infest Amy, Bernadette, Howard and Raj with pinkeye.
S9 Ep19
7.6
31st Mar 2016
Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Also, Koothrappali sells out Leonard and Wolowitz after they lie to their wives in order to attend an early screening of a movie.
S9 Ep7
7.6
5th Nov 2015
Wil Wheaton interviews Sheldon for a Star Trek documentary where he reveals the ring and his plan to propose to Amy. Bernadette wants to start renovating the house and the topic of starting a family together with Howard is brought up.
S9 Ep20
7.6
7th Apr 2016
Sheldon spills a secret of Leonard’s when the two take a weekend cabin trip with Penny and Amy. Also, when Koothrappali goes overboard with pregnancy gifts, Wolowitz and Bernadette must draw the line.
S10 Ep5
7.6
17th Oct 2016
Leonard and Penny must separate a quarreling Sheldon and Amy when their cohabitation does not go as planned, and Sheldon threatens to break off their relationship when Amy refuses to adhere to the bathroom schedule. Also, Howard and Bernadette find unexpected guests at their house when they decide to stay home from a planned vacation.
S9 Ep14
7.6
4th Feb 2016
Meemaw meets Amy, but it isn't all roses. Meemaw seems to have an axe to grind with her. Sheldon comes to Amy's defense, but not before Meemaw lets a little secret of his slip.
S8 Ep3
7.6
29th Sep 2014
Wolowitz feels nervous when he is asked to throw the first pitch at a Los Angeles Angels game. Penny and Leonard want to prove Sheldon wrong after he says he and Amy are the better couple.
S8 Ep1
7.6
22nd Sep 2014
Leonard and Amy make an unexpected trip to Arizona to fetch Sheldon; Penny interviews for a job at Bernadette's company; Stuart's relationship with Mrs. Wolowitz disturbs Howard.
S9 Ep22
7.6
28th Apr 2016
The gang goes to a wine bar and runs into Penny’s old boyfriend, Zack. Also, Bernadette gets stuck spending the evening with Sheldon when she can’t go wine tasting with the group, and things don’t go as planned when Koothrappali introduces his new girlfriend, Claire.
S10 Ep2
7.6
26th Sep 2016
Colonel Williams, an Air Force representative from the Department of Material Command sits down to talk with Wolowitz.
S9 Ep3
7.6
5th Oct 2015
The guys' science skills are put to the test when they get a flat tire during Leonard's bachelor party weekend in Mexico. Also, the girls force Penny to finally tell her family that she eloped with Leonard.
S11 Ep10
7.7
7th Dec 2017
Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Also, Raj “breaks up” with Howard after realizing his best friend is actually hurting his confidence.
S12 Ep22
7.7
9th May 2019
Leonard is pleasantly surprised when Beverly comes to visit and she's genuinely kind to him, until he finds out the real reason she's there. Also, Denise and Stuart overstay their welcome at the Wolowitz house.
S8 Ep17
7.7
5th Mar 2015
A trip to the pet store ends in a fight after Amy learns Sheldon has applied for a one-way mission to colonize Mars. Meanwhile, Leonard surprises Penny with a very "adult" purchase, and Raj gets into trouble when he snoops around Emily's apartment.
S11 Ep1
7.7
25th Sep 2017
In the eleventh season opener, Amy gives Sheldon an answer to his proposal while Howard and Bernadette struggle with some unexpected news.
S12 Ep10
7.7
6th Dec 2018
Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon’s past inspires him not to give up. Bernadette turns into a pageant mom when she tries to help Howard ace his Magic Castle audition.
S1 Ep1
8.0
24th Sep 2007
Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
S1 Ep2
8.0
1st Oct 2007
Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.
S1 Ep3
7.8
8th Oct 2007
Leonard asks a woman out after he finds out that Penny is seeing someone.
S1 Ep4
7.9
15th Oct 2007
Sheldon's getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.
S1 Ep5
7.9
22nd Oct 2007
Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
S1 Ep6
8.0
29th Oct 2007
Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
S1 Ep7
7.9
5th Nov 2007
With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team
S1 Ep8
7.9
12th Nov 2007
Raj's parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.
S1 Ep9
7.9
17th Mar 2008
When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.
S1 Ep10
7.8
24th Mar 2008
Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.
S1 Ep11
7.9
31st Mar 2008
With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed by Penny, who hasn't a clue what she's in for.
S1 Ep12
7.8
14th Apr 2008
With Sheldon rattled over meeting Dennis, a 15-year-old physicist who's smarter than he, Leonard helps him look for a way to debunk Dennis's research.
S1 Ep13
7.9
21st Apr 2008
Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.
S1 Ep14
7.9
28th Apr 2008
When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.
S1 Ep15
7.9
5th May 2008
The rest of the gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll be the one to decide who can date her.
S1 Ep16
8.0
12th May 2008
Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
S1 Ep17
8.1
19th May 2008
Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.
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The first episode of The Big Bang Theory aired on September 24, 2007.
The last episode of The Big Bang Theory aired on May 16, 2019.
There are 279 episodes of The Big Bang Theory.
There are 12 seasons of The Big Bang Theory.
No.
The Big Bang Theory has ended.