
The Big Bang Theory Episode Rating Graph
Sep 2007 - May 2019

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Sep 2007 - May 2019
7.9
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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.
S3 Ep11
8.3
14th Dec 2009
A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.
S12 Ep9
8.3
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.
S8 Ep24
8.2
7th May 2015
As Sheldon presses Leonard and Penny to set a wedding date, he encounters major changes in his own relationship with Amy. Meanwhile, Raj contemplates breaking up with Emily, and Howard and Bernadette struggle with asking Stuart to move out of their house.
S12 Ep3
8.2
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.
S6 Ep24
8.2
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.
S5 Ep23
8.2
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.
S8 Ep7
8.2
30th Oct 2014
The guys try to help Penny out of an awkward work dilemma, when a smitten doctor shows up at her door after her flirtatious sales techniques work a little too well. Meanwhile, Amy and Bernadette argue over whether or not female scientists should play up their sexuality.
S12 Ep6
8.2
25th Oct 2018
When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party. Leonard is shocked that Penny doesn't remember their first kiss.
S10 Ep21
8.2
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.
S10 Ep23
8.2
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.
S8 Ep21
8.2
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.
S8 Ep14
8.2
5th Feb 2015
Leonard and Sheldon publish a paper which is widely accepted except for comments from an internet troll. Meanwhile, the girls reminisce about embarrassing incidents from their past.
S5 Ep22
8.1
26th Apr 2012
After the guys throw Howard a bachelor party, Bernadette reconsiders marrying him after learning about his sexual history.
S10 Ep20
8.1
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.
S8 Ep23
8.1
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.
S12 Ep19
8.1
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.
S5 Ep8
8.1
3rd Nov 2011
Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her.
S10 Ep10
8.1
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.
S6 Ep18
8.1
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.
S10 Ep19
8.1
30th Mar 2017
Leonard, Penny and Raj adjust to their new living arrangement, and Sheldon takes an interest in Amy’s work.
S8 Ep18
8.1
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.
S2 Ep17
8.1
9th Mar 2009
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.
S6 Ep20
8.1
4th Apr 2013
The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.
S6 Ep11
8.1
13th Dec 2012
During a Dungeons and Dragons game, Sheldon revisits Christmas memories; Amy, Penny and Bernadette look for a date for Raj.
S8 Ep19
8.1
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.
S12 Ep15
8.1
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.
S10 Ep12
8.1
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.
S10 Ep13
8.1
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.
S6 Ep9
8.1
29th Nov 2012
When the University reassigns Sheldon’s parking spot to Wolowitz, their fight affects the whole gang.
S8 Ep20
8.1
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.
S10 Ep24
8.1
11th May 2017
The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.
S3 Ep15
8.1
8th Feb 2010
Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.
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.
S10 Ep8
8.1
10th Nov 2016
After a successful experiment combining their genes, Sheldon will stop at nothing to convince Amy they should procreate. Also, Koothrappali is embarrassed to tell the gang what the new woman he’s dating does for a living.
S8 Ep13
8.1
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 Ep11
8.1
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 Ep9
8.1
17th Nov 2016
When Bert, a Caltech geologist, wins the MacArthur Genius fellowship, Sheldon is overcome with jealousy. Also, Wolowitz finds an old remote control Stephen Hawking action figure he invented.
S6 Ep23
8.1
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.
S3 Ep7
8.1
9th Nov 2009
A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
S12 Ep24
8.0
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.
S5 Ep14
8.0
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.
S10 Ep4
8.0
10th Oct 2016
When Amy’s apartment floods, she proposes a “cohabitation experiment” with Sheldon. Also, Howard and Bernadette are upset when Koothrappali learns the gender of the baby before they do.
S12 Ep2
8.0
27th Sep 2018
Sheldon and Amy drive themselves crazy trying to figure out what 'perfect gift' Leonard and Penny gave them for their wedding. Raj decides he wants to settle down and asks his father to arrange a marriage for him.
S3 Ep3
8.0
5th Oct 2009
Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
S6 Ep21
8.0
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.
S8 Ep17
8.0
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.
S6 Ep1
8.0
27th Sep 2012
With his friends on dates, Raj must face his loneliness. Also, Wolowitz is caught in an argument between Bernadette and his mom, even while he’s in space.
S10 Ep15
8.0
9th Feb 2017
Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette out for the night, leaving Raj and Stuart to care for baby Halley.
S5 Ep6
7.7
20th Oct 2011
Sheldon's mother, Mary Cooper, comes to visit, but Sheldon is annoyed that she also spends time with the rest of the gang, instead of catering to his every demand.
S8 Ep11
7.7
11th Dec 2014
Leonard and Howard turn to Raj for help in dealing with a work emergency when they nearly come to blows after blaming each other for a potential disaster at the university. Amy throws an authentic Victorian Christmas party, while Sheldon seeks revenge on her for making him celebrate the holidays.
S6 Ep12
7.8
3rd Jan 2013
When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Howard in trouble.
S6 Ep10
7.8
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.
S6 Ep14
7.8
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.
S2 Ep3
7.8
6th Oct 2008
Sheldon creates a monster when he introduces Penny to online gaming.
S3 Ep10
7.8
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.
S3 Ep2
7.8
28th Sep 2009
Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.
S2 Ep12
7.8
12th Jan 2009
Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.
S2 Ep10
7.8
8th Dec 2008
Leonard asks Penny for advice when his new relationship starts moving too fast.
S5 Ep3
7.8
29th Sep 2011
Leonard and Amy get to know each other better, while Howard and Bernadette spend the weekend with Mrs. Wolowitz.
S3 Ep12
7.8
11th Jan 2010
Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.
S12 Ep17
7.8
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.
S5 Ep2
7.8
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.
S3 Ep13
7.8
18th Jan 2010
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
S12 Ep18
7.8
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.
S3 Ep17
7.8
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 Ep7
7.8
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.
S12 Ep12
7.8
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.
S10 Ep1
7.8
19th Sep 2016
After Sheldon’s mother and Leonard's father share an evening together, everyone deals with an awkward morning the next day. Also, Penny’s family arrives for the wedding ceremony, including her anxiety-ridden mother, Susan, and her drug dealing brother, Randall.
S12 Ep13
7.8
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.
S6 Ep5
7.9
25th Oct 2012
The gang celebrates Halloween at Stuart’s comic book store. Meanwhile, Leonard seduces Penny with science.
S3 Ep20
7.9
3rd May 2010
When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
S3 Ep14
7.9
1st Feb 2010
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
S3 Ep4
7.9
12th Oct 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 a third wheel.
S12 Ep16
7.9
21st Feb 2019
The gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game involving William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith. Deception and betrayal are the path to make it to the one open seat.
S5 Ep4
7.9
6th Oct 2011
Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.
S8 Ep8
7.9
6th Nov 2014
The girls decide to re-enact their high school proms with the guys. While Sheldon feels under pressure to commit to his relationship with Amy, Howard worries about who Stuart will bring as his date.
S2 Ep4
7.9
13th Oct 2008
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S5 Ep19
7.9
8th Mar 2012
Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys.
S6 Ep4
7.9
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.
S6 Ep7
7.9
8th Nov 2012
Wolowitz struggles with moving out of his mother’s house. Meanwhile, Sheldon is caught in the middle of an argument between Amy and Wil Wheaton.
S12 Ep10
7.9
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.
S2 Ep5
7.9
20th Oct 2008
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S5 Ep13
7.9
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.
S10 Ep2
7.9
26th Sep 2016
Colonel Williams, an Air Force representative from the Department of Material Command sits down to talk with Wolowitz.
S8 Ep6
7.9
20th Oct 2014
Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel deep underground. Meanwhile, Leonard and Penny seek advice from Howard and Bernadette after they fight about money.
S3 Ep8
7.9
16th Nov 2009
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
S2 Ep11
7.9
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 Ep21
7.9
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.
S3 Ep1
7.9
21st Sep 2009
When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.
S5 Ep15
7.9
2nd Feb 2012
Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile, Wolowitz tries to pick his astronaut nickname.
S2 Ep9
7.9
24th Nov 2008
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
S6 Ep6
7.9
1st Nov 2012
Sheldon’s relationship with Stephen Hawking is threatened over a game of “Words with Friends,” and Penny secretly enrolls in a class at the local college.
S10 Ep17
7.9
23rd Feb 2017
With Koothrappali cut off from his father’s fortune, he appoints Sheldon to help him get out of debt. Also, Penny considers joining Leonard at Comic-Con.
S3 Ep5
7.9
19th Oct 2009
After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.
S3 Ep16
7.9
1st Mar 2010
Sheldon winds up in traffic court when he gets a ticket because of Penny.
S12 Ep22
7.9
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.
S2 Ep1
8.0
22nd Sep 2008
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
S2 Ep2
8.0
29th Sep 2008
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
S2 Ep3
7.8
6th Oct 2008
Sheldon creates a monster when he introduces Penny to online gaming.
S2 Ep4
7.9
13th Oct 2008
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S2 Ep5
7.9
20th Oct 2008
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S2 Ep6
8.0
3rd Nov 2008
Sheldon and the gang are confused when a young grad student is attracted to him.
S2 Ep7
7.9
10th Nov 2008
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
S2 Ep8
7.9
17th Nov 2008
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
S2 Ep9
7.9
24th Nov 2008
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
S2 Ep10
7.8
8th Dec 2008
Leonard asks Penny for advice when his new relationship starts moving too fast.
S2 Ep11
7.9
15th Dec 2008
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
S2 Ep12
7.8
12th Jan 2009
Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.
S2 Ep13
7.9
19th Jan 2009
Sheldon creates a scientific procedure for making friends.
S2 Ep14
7.9
2nd Feb 2009
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
S2 Ep15
7.9
9th Feb 2009
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
S2 Ep16
8.0
2nd Mar 2009
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S2 Ep17
8.1
9th Mar 2009
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.
S2 Ep18
16th Mar 2009
Penny's home business turns into a complete nightmare when Sheldon takes over.
S2 Ep19
30th Mar 2009
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
S2 Ep20
13th Apr 2009
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
S2 Ep21
27th Apr 2009
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
S2 Ep22
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.
S2 Ep23
11th May 2009
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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.