The Big Bang Theory

This article is about the television series. For the scientific theory, see Big Bang. For other uses, see Big Bang Theory (disambiguation).
"TBBT" redirects here. For the Discovery Channel series, see The Big Brain Theory.
The Big Bang Theory
Genre Sitcom
Created by Chuck Lorre
Bill Prady
Directed by Mark Cendrowski
Theme music composer Barenaked Ladies
Opening theme "Big Bang Theory Theme"[1][2]
Country of origin United States
Original language(s) English
No. of seasons 10
No. of episodes 217 (list of episodes)
Executive producer(s) Chuck Lorre
Steven Molaro
Bill Prady
Producer(s) Faye Oshima Belyeu
Editor(s) Peter Chakos
Camera setup Multi-camera
Running time 18–22 minutes
Production company(s) Chuck Lorre Productions
Warner Bros. Television
Distributor Warner Bros. Television Distribution
Original network CBS
Picture format HDTV 1080i
Audio format Dolby Digital 5.1
Original release September 24, 2007 (2007-09-24) – present
External links

The Big Bang Theory (often shortened to Big Bang Theory, and abbreviated to TBBT or BBT) is an American television sitcom created by Chuck Lorre and Bill Prady, both of whom serve as executive producers on the series, along with Steven Molaro. All three also serve as head writers. The show premiered on CBS on September 24, 2007.[3] In March 2014, the show was renewed for three more years through a tenth season, which premiered on September 19, 2016.[4][5]

The show is primarily centered on five characters living in Pasadena, California: Leonard Hofstadter and Sheldon Cooper, both physicists at Caltech, who share an apartment; Penny, a waitress and aspiring actress who later becomes a pharmaceutical representative and who lives across the hall; and Leonard and Sheldon's similarly geeky and socially awkward friends and co-workers, aerospace engineer Howard Wolowitz and astrophysicist Raj Koothrappali. The geekiness and intellect of the four guys are contrasted for comic effect with Penny's social skills and common sense.[6][7]

Over time, supporting characters have been promoted to starring roles: Bernadette Rostenkowski, Howard's girlfriend (later his wife), a microbiologist and former part-time waitress alongside Penny; neuroscientist Amy Farrah Fowler, who joins the group after being matched to Sheldon on a dating website (and later becomes Sheldon's girlfriend); Stuart Bloom, the cash-strapped owner of the comic book store the characters often visit; Leslie Winkle, a physicist who dated Leonard and Howard; and Emily Sweeney, a dermatologist who dated Raj and had a fascination with the macabre.


The structure of the original, unaired pilot, developed for the 2006–07 television season, was substantially different from the series' current form. The only characters retained in both pilots were Leonard (Johnny Galecki) and Sheldon (Jim Parsons), who are named after Sheldon Leonard. Althea (Vernee Watson) was a character featured in both pilots and the first series episode.[8] Two female leads were Canadian actress Amanda Walsh as Katie, "a street-hardened, tough-as-nails woman with a vulnerable interior",[9][10] and Iris Bahr as Gilda, a scientist colleague and friend of the male characters. Sheldon and Leonard meet Katie after she breaks up with a boyfriend and they invite her to share their apartment; Gilda is threatened by Katie's presence. Test audiences reacted negatively to Katie, but they liked Sheldon and Leonard. The original pilot used Thomas Dolby's hit "She Blinded Me with Science" as the theme song.

The series was not picked up, but the creators were given an opportunity to retool the show and produce a second pilot. They brought in the remaining cast and retooled the show to its final format. Katie was replaced by Penny (Kaley Cuoco). The original unaired pilot has never been officially released, but it has circulated on the Internet. On the evolution of the show, Chuck Lorre said, "We did the 'Big Bang Pilot' about two and a half years ago, and it sucked... but there were two remarkable things that worked perfectly, and that was Johnny and Jim. We rewrote the thing entirely and then we were blessed with Kaley and Simon and Kunal." As to whether the world will ever see the original pilot on a future DVD release, Lorre said, "Wow, that would be something, we will see. Show your failures..."[11]

The first and second pilots of The Big Bang Theory were directed by James Burrows, who did not continue with the show. The reworked second pilot led to a 13-episode order by CBS on May 14, 2007.[12] Prior to its airing on CBS, the pilot episode was distributed on iTunes free of charge. The show premiered on September 24, 2007, and was picked up for a full 22-episode season on October 19, 2007.[13] The show is filmed in front of a live audience,[14] and is produced by Warner Bros. Television and Chuck Lorre Productions.[15] Production was halted on November 6, 2007, due to the Writers Guild of America strike. Nearly three months later, on February 4, 2008, the series was temporarily replaced by a short-lived sitcom, Welcome to the Captain. The series returned on March 17, 2008, in an earlier time slot[16] and ultimately only 17 episodes were produced for the first season.[17][18] After the strike ended, the show was picked up for a second season, airing in the 2008–2009 season, premiering in the same time slot on September 22, 2008.[19] With increasing ratings, the show received a two-year renewal through the 2010–11 season in 2009.[20][21] In 2011, the show was picked up for three more seasons.[22] In March 2014, the show was renewed again for three more years through the 2016–17 season. Therefore, the series will at least reach 10 seasons. This marks the second time the series has gained a three-year renewal.[4]

David Saltzberg, a professor of physics and astronomy at the University of California, Los Angeles, checks scripts and provides dialogue, mathematics equations, and diagrams used as props.[6] According to executive producer/co-creator Bill Prady, "We're working on giving Sheldon an actual problem that he's going to be working on throughout the [first] season so there's actual progress to the boards...We worked hard to get all the science right."[7]

Several of the actors in The Big Bang Theory previously worked together on Roseanne, including Johnny Galecki, Sara Gilbert, Laurie Metcalf (who plays Sheldon's mother, Mary Cooper), and Meagen Fay (who plays Bernadette's mother). Additionally, Lorre was a writer on the series for several seasons.

Theme song

Single cover for "Big Bang Theory Theme" by Barenaked Ladies (2007)

The Canadian alternative rock band Barenaked Ladies wrote and recorded the show's theme song, which describes the history and formation of the universe and the Earth. Co-lead singer Ed Robertson was asked by Lorre and Prady to write a theme song for the show after the producers attended one of the band's concerts in Los Angeles. By coincidence, Robertson had recently read Simon Singh's book Big Bang,[23][24] and at the concert, he improvised a freestyle rap about the origins of the universe. Lorre and Prady phoned Robertson shortly thereafter and asked him to write the theme song. Having been asked to write songs for other films and shows, but ending up being rejected because of producer's favor of other artist's song, Robertson agreed to write the theme only after learning that Lorre and Prady had not asked anyone else.

On October 9, 2007, a full-length (1 minute and 45 seconds) version of the song was released commercially.[25] Although some sources identify the song title as "History of Everything",[26] the cover art for the single identifies the title as "Big Bang Theory Theme". A music video was also released via special features on The Complete Fourth Season DVD and Blu-ray set.[27][28] The theme was included on the band's greatest hits album, Hits from Yesterday & the Day Before, which was released on September 27, 2011.[29] In September 2015, TMZ uncovered court documents showing that Steven Page sued former bandmate Robertson over the song, alleging that he was promised 20% of the proceeds, but that Robertson has kept that money entirely for himself.[30]

Actors' salaries

For the first three seasons, Galecki, Parsons, and Cuoco, the three main stars of the show, received at most $60,000 per episode. The salary for the three went up to $200,000 per episode for the fourth season. Their per-episode pay went up an additional $50,000 in each of the following three seasons, culminating in $350,000 per episode in the seventh season.[31][32] By season seven, the three were also receiving 0.25% of the series' back-end money.[33] Before production began on the eighth season, the five main stars looked to renegotiate new contracts, with Galecki, Parsons, and Cuoco seeking around $1 million per episode, as well as more back-end money.[33] Contracts were signed in the beginning of August 2014, giving the three principal actors an estimated $1 million per episode for three years, with the possibility to extend for a fourth year. The deals also include larger pieces of the show, signing bonuses, production deals, and advances towards the back-end.[34]

In September 2013, Bialik and Rauch renegotiated the contracts they held since they were introduced to the series in 2010. On their old contracts, each was making $20,000–$30,000 per episode, while the new contracts doubled that, beginning at $60,000 per episode, increasing steadily to $100,000 per episode by the end of the contract, as well as adding another year for both.[35]

In August 2014, Helberg and Nayyar renegotiated their contracts, giving them a per-episode pay in the "mid-six-figure range," up from around $100,000 per episode they each received in years prior. The duo, who were looking to have salary parity with Parsons, Galecki, and Cuoco, signed their contracts after the studio and producers threatened to write the characters out of the series if a deal could not be reached before the start of production on season eight.[36]

Cast and characters

Main characters in The Big Bang Theory. First row from left: Rajesh Koothrappali, Leonard Hofstadter, Penny, Sheldon Cooper, and Howard Wolowitz, second row from left: Bernadette Rostenkowski-Wolowitz and Amy Farrah Fowler

These actors are credited in all episodes of the series:

These actors were first credited as guest stars and later promoted to main cast:

Scientist cameos

As the theme of the show revolves around science, many distinguished and high-profile scientists have appeared as guest stars on the show. Famous astrophysicist and Nobel laureate George Smoot had a cameo appearance in episode 17 "The Terminator Decoupling", of the second season.[51] Theoretical physicist Brian Greene also appeared on the show in "The Herb Garden Germination", episode 20 of the fourth season. Astrophysicist, science populizer, and physics outreach specialist, Neil deGrasse Tyson appeared in "The Apology Insufficiency", episode 7 of the fourth season. Cosmologist Stephen Hawking made a short guest appearance in the fifth-season episode "The Hawking Excitation" on April 5, 2012.[52] In the episode, he meets Sheldon and points out a mistake in Sheldon's new Higgs boson analysis. Hawking also speaks on the phone at the end of the episode "The Extract Obliteration" with Sheldon but is not seen on-camera. In season 8 episode 14, Hawking video-conferences with Sheldon and Leonard after trolling their joint paper online. Hawking makes another appearance through a video call in season 9 episode 17 named 'The Celebration Experimentation' (the 200th episode). In the end of season 5 and the beginning of season 6, NASA astronaut Michael J. Massimino played himself multiple times in the role of Howard's fellow astronaut. In season 7, Bill Nye appears in an episode ("The Proton Displacement") in which Sheldon feels slighted by his childhood science hero, Professor Proton, hiring Bill to fill the void. Elon Musk appears in season 9's "The Platonic Permutation," where he and Howard volunteer at a homeless shelter on Thanksgiving.


SeasonEpisodesOriginally airedNielsen ratings
First airedLast airedViewers
117September 24, 2007 (2007-09-24)May 19, 2008 (2008-05-19)8.3168[53]3.3/846[54]
223September 22, 2008 (2008-09-22)May 11, 2009 (2009-05-11)10.0340[55]N/AN/A
323September 21, 2009 (2009-09-21)May 24, 2010 (2010-05-24)14.22125.3/135[56]
424September 23, 2010 (2010-09-23)May 19, 2011 (2011-05-19)13.14134.4/137[57]
524September 22, 2011 (2011-09-22)May 10, 2012 (2012-05-10)15.8285.5/176[58]
624September 27, 2012 (2012-09-27)May 16, 2013 (2013-05-16)18.6836.2/192[59]
724September 26, 2013 (2013-09-26)May 15, 2014 (2014-05-15)19.9626.2/202[60]
824September 22, 2014 (2014-09-22)May 7, 2015 (2015-05-07)19.0525.6/174[61]
924September 21, 2015 (2015-09-21)May 12, 2016 (2016-05-12)19.3625.8/193[62]
10TBASeptember 19, 2016 (2016-09-19)TBATBATBATBATBA

Recurring themes and elements


Much of the series focuses on science, particularly physics. The four main male characters are employed at Caltech and have science-related occupations, as do Bernadette and Amy. The characters frequently banter about scientific theories or news (notably around the start of the show), and make science-related jokes.

Science has also interfered with the characters' romantic lives. Leslie breaks up with Leonard when he sides with Sheldon in his support for string theory rather than loop quantum gravity.[63] When Leonard joins Sheldon, Raj, and Howard on a three-month Arctic research trip, it separates Leonard and Penny at a time their relationship is budding. When Bernadette takes an interest in Leonard's work, it makes both Penny and Howard envious and results in Howard confronting Leonard, and Penny asking Sheldon to teach her physics.[64] Sheldon and Amy also briefly end their relationship after an argument over which of their fields is superior.[65]

David Saltzberg, who has a PhD in physics, has served as the science consultant for the show for six seasons and attends every taping.[66] While Saltzberg knows physics, he sometimes needs assistance from Mayim Bialik, who has a PhD in neuroscience.[67] Saltzberg sees early versions of scripts which need scientific information added to them, and he also points out where the writers, despite their knowledge of science, have made a mistake. He is usually not needed during a taping unless a lot of science, and especially the whiteboard, is involved.[67]

Science fiction media

The four main male characters are all avid science fiction, fantasy, and comic book fans and memorabilia collectors.

Star Trek in particular is frequently referenced and Sheldon identifies strongly with the character of Spock, so much so that when he is given a used napkin signed by Leonard Nimoy as a Christmas gift from Penny he is overwhelmed with excitement and gratitude ("I possess the DNA of Leonard Nimoy?!").[68] Star Trek: The Original Series cast member George Takei has made a cameo, and Leonard Nimoy made a cameo as the voice of Sheldon's vintage Mr. Spock action figure (both cameos were in dream sequences). Star Trek: The Next Generation cast members Brent Spiner and LeVar Burton have had cameos as themselves,[69][70] while Wil Wheaton has a recurring role as a fictionalized version of himself.

They are also fans of Star Wars, Battlestar Galactica, and Doctor Who. In the episode "The Ornithophobia Diffusion", when there is a delay in watching Star Wars on Blu-ray, Howard complains, "If we don't start soon, George Lucas is going to change it again" (referring to Lucas' controversial alterations to the films) and in "The Hot Troll Deviation", Katee Sackhoff of Battlestar Galactica appeared as Howard's fantasy dream girl. The characters have different tastes in franchises with Sheldon praising Firefly but disapproving of Leonard's enjoyment of Babylon 5.[71][n 1] With regard to fantasy, the four make frequent references to The Lord of the Rings and Harry Potter novels and movies. Additionally, Howard can speak Sindarin, one of the two Elvish languages from The Lord of the Rings.

Wednesday night is the group's designated "comic book night"[72] because that is the day of the week when new comic books are released. The comic book store is run by fellow geek and recurring character Stuart. On a number of occasions, the group members have dressed up as pop culture characters, including The Flash, Aquaman, Frodo Baggins, Superman, Batman, Spock, The Doctor, Green Lantern, and Thor.[73] As a consequence of losing a bet to Stuart and Wil Wheaton, the group members are forced to visit the comic book store dressed as Catwoman, Wonder Woman, Batgirl, and Supergirl.[74] DC Comics announced that, to promote its comics, the company will sponsor Sheldon wearing Green Lantern T-shirts.[75]

Various games have been featured, as well as referenced, on the series (e.g. World of Warcraft, Halo, Mario, etc.), including fictional games like Mystic Warlords of Ka'a (which became a reality in 2011)[76] and Rock-paper-scissors-lizard-Spock.

Leonard and Penny's relationship

One of the recurring plot lines is the relationship between Leonard and Penny. Leonard becomes attracted to Penny in the pilot episode and his need to do favors for her is a frequent point of humor in the first season. Their first long term relationship begins when Leonard returns from a three-month expedition to the North Pole in the season 3 premiere. However, when Leonard tells Penny that he loves her, she realizes she cannot say it back. Both Leonard and Penny go on to date other people; most notably with Leonard dating Raj's sister Priya for much of season 4. This relationship is jeopardized when Leonard comes to falsely believe that Raj has slept with Penny, and ultimately ends when Priya sleeps with a former boyfriend in "The Good Guy Fluctuation".

Penny, who admits to missing Leonard in "The Roommate Transmogrification", accepts his request to renew their relationship in "The Beta Test Initiation". After Penny suggests having sex in "The Launch Acceleration", Leonard breaks the mood by proposing to her. Penny says "no" but does not break up with him. She stops a proposal a second time in "The Tangible Affection Proof". In the sixth-season episode, "The 43 Peculiarity", Penny finally tells Leonard that she loves him. Although they both feel jealousy when the other receives significant attention from the opposite sex, Penny is secure enough in their relationship to send him off on an exciting four-month expedition without worrying in "The Bon Voyage Reaction". After Leonard returns, their relationship blossoms over the seventh season. In the penultimate episode "The Gorilla Dissolution", Penny admits that they should marry and when Leonard realizes that she is serious, he proposes with a ring that he had been saving for years. Leonard and Penny decide to elope to Las Vegas in the season 8 finale, but beforehand, wanting no secrets, Leonard admits to kissing another woman, Mandy Chow (Melissa Tang) while on an expedition on the North Sea. Despite this, Leonard and Penny finally elope in the season 9 premiere.

Sheldon and Amy's relationship

In the third-season finale, Raj and Howard search for a woman compatible with Sheldon and discover neurobiologist Amy Farrah Fowler. Like him, she has a history of social ineptitude and participates in online dating only to fulfill an agreement with her mother. This spawns a storyline in which Sheldon and Amy communicate daily while insisting to Leonard and Penny that they are not romantically involved. In "The Agreement Dissection", Sheldon and Amy talk in her apartment after a night of dancing and she kisses him on the lips. Instead of getting annoyed, Sheldon says "fascinating" and later asks Amy to be his girlfriend in "The Flaming Spittoon Acquisition". The same night he draws up "The Relationship Agreement" to verify the ground rules of him as her boyfriend and vice versa (similar to his "Roommate Agreement" with Leonard). Amy agrees but later regrets not having had a lawyer read through it.

In the episode "The Launch Acceleration", Amy tries to use her "neurobiology bag of tricks" to increase the attraction between herself and Sheldon. In the final fifth-season episode "The Countdown Reflection", Sheldon takes Amy's hand as Howard is launched into space. In the sixth season first episode "The Date Night Variable", after a dinner in which Sheldon fails to live up to this expectation, Amy gives Sheldon an ultimatum that their relationship is over unless he tells her something from his heart. Amy accepts Sheldon's romantic speech even after learning that it is a line from the first Spider-Man movie. In "The Cooper/Kripke Inversion" Sheldon states that he has been working on his discomfort about physical contact and admits that "it's a possibility" that he could one day have sex with Amy. Amy is revealed to have similar feelings in "The Love Spell Potential". Sheldon explains that he never thought about intimacy with anyone before Amy.[77]

"The Locomotive Manipulation" is the first episode in which Sheldon initiates a kiss with Amy. Although initially done in a fit of sarcasm, he discovers that he enjoys the feeling. Consequently, Sheldon slowly starts to open up over the rest of the season, and starts a more intimate relationship with Amy. However, in the season finale, Sheldon leaves temporarily to cope with several changes and Amy becomes distraught. However, in "The Prom Equivalency" he hides in his room to avoid going to a mock prom reenactment with her. In the resulting stand-off, Amy is about to confess that she loves Sheldon, but he surprises her by saying that he loves her too. This prompts Amy to have a panic attack.

In the season eight finale, Sheldon and Amy get into a fight about commitment on their 5-year anniversary. Amy tells Sheldon that she needs to think about the future of their relationship, unaware that Sheldon was about to propose to her. Season nine sees Sheldon harassing Amy about making up her mind until she breaks up with him. Both struggle with singlehood and trying to be friends for the next few weeks until they reunite in episode ten and have sex for the first time on Amy's birthday.

Howard's mother

In scenes set at Howard's home, he interacts with his rarely-seen mother (voiced by Carol Ann Susi until her death) by shouting from room to room in the house. She similarly interacts with other characters in this manner.[78] She reflects the Jewish mother stereotype in some ways, such as being overly controlling of Howard's adult life and sometimes trying to make him feel guilty about causing her trouble. She is dependent on Howard, as she requires him to help her with her wig and makeup in the morning. Howard in turn is attached to his mother to the point where she still cuts his meat for him, takes him to the dentist, does his laundry and "grounds" him when he returns home after briefly moving out.[79] Until Howard's marriage to Bernadette in the fifth-season finale, Howard's former living situation led Leonard's psychiatrist mother to speculate that he may suffer from some type of pathology,[80] and Sheldon to refer to their relationship as Oedipal.[81] In season 8, Howard's mother dies in her sleep while in Florida, which devastates Howard and Stuart, who briefly lived with Mrs. Wolowitz.

Vanity cards

Like most shows created by Chuck Lorre, The Big Bang Theory ends by showing a vanity card written by Lorre after the credits, followed by the Warner Bros. Television closing logo. These cards are archived on Lorre's website.[82]

The Theorists

Through the use of his vanity cards at the end of episodes, Lorre alleged that the program had been plagiarized by a show produced and aired in Belarus. Officially titled Теоретики (The Theorists), the show features "clones" of the main characters, a similar opening sequence, and what appears to be a very close Russian translation of the scripts.[83] Lorre expressed annoyance and described his inquiry with the Warner Bros. legal department about options. The television production company and station's close relationship with the Belarus government was cited as the reason that any attempt to claim copyright infringement would be in vain because the company copying the episodes is operated by the government.[84]

However, no legal action was required to end production of the other show: as soon as the word got out that the show was unlicensed, the actors quit and the producers cancelled it.[85] Dmitriy Tankovich (who plays Leonard's counterpart, "Seva") said in an interview: "I'm upset. At first, the actors were told all legal issues were resolved. We didn't know it wasn't the case, so when the creators of The Big Bang Theory started talking about the show, I was embarrassed. I can't understand why our people first do, and then think. I consider this to be the rock bottom of my career. And I don't want to take part in a stolen show".[86]


Critical reception

The Big Bang Theory initially received mixed reviews[87] and originally received a score of 57/100 from review aggregator Metacritic, indicating "mixed or average reviews". Tom Shales of The Washington Post gave the show a positive review, saying "Big Bang is the funniest new sitcom of the season".[88] Robert Bianco of USA Today also gave the show a positive review, saying "This may not be the sitcom breakthrough for which we've all been hoping, but Lorre has produced a first episode that leaves you eager to try the second".[89] Robert Lloyd of the Los Angeles Times gave a mixed review, stating "It's just the same joke endlessly repeated – the everyday translated into geek-speak, and the obscure and difficult treated as if it were common knowledge".[90] Mike Duffy of the Detroit Free Press gave a negative review, stating "This is by far the least charming—the lame, leering sitcom tales of two brainiac losers goofily smitten by the babelicious girl next door. It's about as witty as a pocket protector".[91][92]

However, it received very positive reviews in later seasons.[93][94][95][96] James Chamberlin of IGN gave season 2 an 8.4 out of 10 score, saying, "This may be a show about nerds, but you don't have to be a brainiac to enjoy it."[97] Amanda Sloane Murray, writing for the same website, gave season three 9 out of 10, describing it as "more intelligent than most sitcoms in recent memory".[98] The American Film Institute ranked season three one of the 10 best television seasons of 2009.[99]

Leigh H. Edwards of PopMatters gave season 4 an 8/10, commenting "The comic commentary may be poking gentle fun at nerds, but the real target of the show's sharp satire is the arbitrary, self-serving stupidity of mainstream culture".[100] On the other hand, Brian Tallerico of Hollywood Chicago panned the series writing: "There's nothing here that seems even remotely original."[101]

Tom Gliatto of People remarked of season 5, "It's bright and obvious as a cartoon yet written with a clean, precise patter of jokes. It's also very well cast".[102]

Kate Ward of Entertainment Weekly gave season 6 a positive review, remarking "Bialik manages to steal scenes from Parsons as if she's been with the crew since, well, the big bang".[103] Robert Bianco continued to give a positive review, noting "When it comes to making viewers catch their breath from laughing, no show tops Big Bang, and that's an ability that should never be undervalued in a comedy. Bang is one of those rare series where just thinking about some of the plots is enough to make you laugh all over again".[104] On the other hand, June Thomas of Slant Magazine gave the season a negative review, calling it "disappointing".[105]

In 2013, TV Guide ranked the series #52 on its list of the 60 Best Series of All Time.[106]

U.S. standard ratings

The Big Bang Theory started off slowly in the ratings, failing to make the top 50 in its first season (ranking 68th), and ranking 40th in its second season. When the third season premiered on September 21, 2009, however, The Big Bang Theory ranked as CBS's highest-rated show of that evening in the adults 18–49 demographic (4.6/10) along with a then-series-high 12.83 million viewers.[107] After the first three seasons aired at different times on Monday nights, CBS moved the show to Thursdays at 8:00 ET for the 2010–2011 schedule, to be in direct competition with NBC's Comedy Block and Fox's American Idol (then the longest reigning leading primetime show on U.S. television from 2004 to 2011).[108] During its fourth season, it became television's highest rated comedy, just barely beating out eight-year champ Two and a Half Men. However, in the age 18–49 demographic (the show's target age range), it was the second highest rated comedy, behind ABC's Modern Family. The fifth season opened with viewing figures of over 14 million.[109]

The sixth season boasts some of the highest-rated episodes for the show so far, with a then-new series high set with "The Bakersfield Expedition", with 20 million viewers,[110] a first for the series, which along with NCIS, made CBS the first network to have two scripted series reach that large an audience in the same week since 2007. In the sixth season, the show became the highest rated and viewed scripted show in the 18–49 demographic, trailing only the live regular NBC Sunday Night Football coverage,[111][112] and was third in total viewers, trailing NCIS and Sunday Night Football.[113] Season seven of the series opened strong, continuing the success gained in season six, with the second episode of the premiere, "The Deception Verification", setting the new series high in viewers with 20.44 million.[114][115]

Showrunner Steve Molaro, who took over from Bill Prady with the sixth season, credits some of the show's success to the sitcom's exposure in off-network syndication, particularly on TBS, while Michael Schneider of TV Guide attributes it to the timeslot move two seasons earlier. Chuck Lorre and CBS Entertainment president Nina Tassler also credit the success to the influence of Molaro, in particular the deepening exploration of the firmly established regular characters and their interpersonal relationships, such as the on-again, off-again relationship between Leonard and Penny.[116] Throughout much of the 2012–13 season, The Big Bang Theory placed first in all of syndication ratings, receiving formidable competition from only Judge Judy and Wheel of Fortune (first-run syndication programs). By the end of the 2012–13 television season, The Big Bang Theory had dethroned Judge Judy as the ratings leader in all of syndicated programming with 7.1, Judy descending to second place for that season with a 7.0.[117] The Big Bang Theory did not place first in syndication ratings for the 2013–14 television season, beaten out by Judge Judy.[118]

Season Timeslot (ET) Episodes First aired Last aired TV season Rank Avg. viewers
Date Viewers
Date Viewers
1 Monday 8:30pm (1–8)
Monday 8:00pm (9–17)
17 September 24, 2007 (2007-09-24) 9.52[119] May 19, 2008 (2008-05-19) 7.34[120] 2007–08 68 8.31[121]
2 Monday 8:00pm (1–14, 16–23)
Monday 9:30pm (15)[122]
23 September 22, 2008 (2008-09-22) 9.36[123] May 11, 2009 (2009-05-11) 9.81[124] 2008–09 40 10.03[125]
3 Monday 9:30pm (1–19, 21–23)
Monday 9:00pm (20)[122]
23 September 21, 2009 (2009-09-21) 12.96[126] May 24, 2010 (2010-05-24) 14.78[127] 2009–10 12 14.22[128]
4 Thursday 8:00pm 24 September 23, 2010 (2010-09-23) 14.04[129] May 19, 2011 (2011-05-19) 11.30[130] 2010–11 13 13.21[131]
5 24 September 22, 2011 (2011-09-22) 14.30[132] May 10, 2012 (2012-05-10) 13.72[133] 2011–12 8 15.82[134]
6 24 September 27, 2012 (2012-09-27) 15.66[135] May 16, 2013 (2013-05-16) 15.48[136] 2012–13 3 18.68[137]
7 24 September 26, 2013 (2013-09-26) 18.99[138] May 15, 2014 (2014-05-15) 16.73[139] 2013–14 2 19.96[140]
8 Monday 8:00pm (1–6)
Thursday 8:00pm (7–24)
24 September 22, 2014 (2014-09-22) 18.08[141] May 7, 2015 (2015-05-07) 14.64[142] 2014–15 2 19.05[143]
9 24 September 21, 2015 (2015-09-21) 18.20[144] May 12, 2016 (2016-05-12) 14.73[145] 2015–16 2 19.36[62]
10 Monday 8:00pm (1–5)
Thursday 8:00pm (6–)
TBA September 19, 2016 (2016-09-19) 15.82[146] TBA TBD 2016–17 TBD TBD

UK distribution and ratings

The show made its United Kingdom debut on Channel 4 on February 14, 2008. The show was also shown as a 'first-look' on Channel 4's digital offshoot E4 prior to the main channel's airing. While the show's ratings were not deemed strong enough for the main channel, they were considered the opposite for E4. For each following season, all episodes were shown first-run on E4, with episodes only aired on the main channel in a repeat capacity, usually on a weekend morning. From the third season, the show aired in two parts, being split so that it could air new episodes for longer throughout the year. This was due to rising ratings. The first part began airing on December 17, 2009 at 9:00 p.m. while the second part, containing the remaining eleven episodes, began airing in the same time period from May 6, 2010. The first half of the fourth season began airing on November 4, 2010, at 9:00 p.m., drawing 877,000 viewers, with a further 256,000 watching on the E4+1 hour service. This gave the show an overall total of 1.13 million viewers, making it E4's most watched programme for that week. The increased ratings continued over subsequent weeks.[147] The fourth season's second half began on June 30, 2011. Season 5 began airing on November 3, 2011 at 8:00 p.m. as part of E4's Comedy Thursdays, acting as a lead-in to the channel's newest comedy, Perfect Couples. Episode 19, the highest-viewed episode of the season, attracted 1.4 million viewers.[148] Season 6 premiered on November 15, 2012, with 1.89 million viewers and a further 469,000 on the time shift channel, bringing the total to 2.31 million, E4's highest viewing ratings of 2012, and the highest the channel had received since June 2011. The sixth season returned in mid 2013 to finish airing the remaining episodes.[149] Season 7 premiered on E4 on October 31, 2013 at 8:30pm and hit multiple ratings records this season. The second half of season seven aired in mid 2014.[150] The eighth season premiered on E4 on October 23, 2014 at 8:30 p.m.[151] During its eighth season, The Big Bang Theory shared its 8:30 p.m. time period with fellow CBS comedy, 2 Broke Girls. Following the airing of the first eight episodes of that show's fourth season, The Big Bang Theory returned to finish airing its eighth season on March 19, 2015.[152]

Netflix UK & Ireland announced on 13 February 2016 that seasons 1-8 would be available to stream from 15 February 2016.[153]

Canadian ratings

The Big Bang Theory started off quietly in Canada, but managed to garner major success in later seasons. The Big Bang Theory is telecast throughout Canada via the CTV Television Network in simultaneous substitution with cross-border CBS affiliates. Now immensely popular in Canada, The Big Bang Theory is also rerun daily on the Canadian cable channel The Comedy Network.

The season 4 premiere garnered an estimated 3.1 million viewers across Canada. This is the largest audience for a sitcom since the series finale of Friends(12.4 million viewers). The Big Bang Theory has pulled ahead and has now become the most-watched entertainment television show in Canada.[154]


The Big Bang Theory premiered in the United States on September 24, 2007 on CBS. The series debuted in Canada on CTV in September 2007.[155] On February 14, 2008, the series debuted in the United Kingdom on channels E4 and Channel 4.[156] In Australia the first seven seasons of the series began airing on the Seven Network and 7mate from October 2015 and also gained the rights to season 8 in 2016, though the Nine Network has rights to air seasons nine & ten.[157][158]


In May 2010, it was reported that the show had been picked up for syndication, mainly among Fox's owned and operated stations and other local stations, with Warner Bros. Television's sister cable network TBS holding the show's cable syndication rights. Broadcast of old shows began airing in September 2011. TBS now airs the series in primetime on Tuesdays, Wednesdays, and Thursdays, with evening broadcasts on Saturdays (TBS's local sister station in Atlanta also holds local weeknight rights to the series).[159] Although details of the syndication deal have not been revealed, it was reported the deal "set a record price for a cable off-network sitcom purchase".[160] CTV holds national broadcast syndication rights in Canada, while sister cable network The Comedy Network holds cable rights.

Online media

Warner Bros. Television controls the online rights for the show.[161][162] Full episodes are available at, while short clips and recently aired full episodes are available on[163] In Canada, recent episode(s) and pictures are available on[164] After the show has aired in New Zealand the shows are available in full online at TVNZ's on demand web service.

Home media

Name Release dates No. of
Additional Information
Region 1 Region 2 Region 4
The Complete First Season September 2, 2008[165] January 12, 2009[166] April 3, 2009[167] 17
  • 3-disc box set
  • "Quantum Mechanics of The Big Bang Theory: Series Cast and Creators on Why It's Cool to Be a Geek".
  • Gag reel (Blu-ray exclusive)
The Complete Second Season September 15, 2009[168] October 19, 2009[169] March 3, 2010[170] 23
  • 4-disc box set
  • Gag reel
  • "Physicist to the Stars: Real-Life Physicist/UCLA professor David Saltzberg's consulting relationship to the Show"
  • "Testing the Infinite Hilarity Hypothesis in relation to the Big Bang Theory: Season 2's Unique Characters and Characteristics"
The Complete Third Season September 14, 2010[171] September 27, 2010[172] October 13, 2010[173] 23
  • 3-disc box set
  • Set tour with Simon Helberg and Kunal Nayyar
  • Inside look on the third season
  • Gag reel
The Complete Fourth Season September 13, 2011[174] September 26, 2011[175] October 5, 2011[176] 24
  • 3-disc box set
  • Story of show's theme song with Barenaked Ladies
  • Music video for the theme song
  • Cast interviews
  • Gag reel
The Complete Fifth Season September 11, 2012[177] September 3, 2012[178] October 3, 2012[179] 24
  • 3-disc box set
  • "The Big Bang Theory at 100"
  • "The Big Bang Theory's Laws of Reflection"
  • "Professors of Production"
  • Gag reel
The Complete Sixth Season September 10, 2013[180] September 2, 2013[181] October 11, 2013[182] 24
  • 3-disc box set
  • "The Big Bang Theory: The Final Comedy Frontier"
  • "Houston, We Have a Sitcom"
  • "Electromagnetism: The Best Relationship Moments"
  • "The Big Bang Theory at Paleyfest 2013"
  • Gag reel
The Complete Seventh Season September 16, 2014[183] September 8, 2014[184] September 17, 2014[185] 24
  • String Theory Serenade
  • James Earl Jones: The Un-Conventional Guest Star
  • BBTea Time
  • The Big Bang Theory's May the 4th
  • The Convention Conundrum
  • The Big Cendrowski
  • 2013 Comic-Con Panel
  • Gag Reel
The Complete Eighth Season September 15, 2015[186] September 14, 2015[187] September 16, 2015[188] 24
  • Shooting Stars: BBT on BBT
  • 2014 The Big Bang Theory Comic-Con Panel
  • Constellation Prize
  • Here's To You, Carol Ann Susi
  • It's A Quark...It's An Atom...It's the #BBTSuperfans!
  • Gag Reel
The Complete Ninth Season September 13, 2016[189] August 29, 2016[190] August 31, 2016[191] 24
  • The Big Bang Theory Gives Back
  • BBT: The Big 200!
  • Love IS Rocket Science
  • Just Ask BBT: If I Had To Go To Mars...
  • Just Ask BBT: Who Will Get The Couch?
  • 2015 Comic-Con Panel
  • Gag Reel

The first and second seasons were only available on DVD upon their time of release in 2008[192] and 2009.[193] Starting with the release of the third season in 2010[194] and continuing every year with every new season, a Blu-ray disc set has also been released in conjunction with the DVD. In 2012, Warner Bros. released the first two seasons on Blu-ray,[195] marking the first time that all episodes were available on the Blu-ray disc format.

Awards and nominations

In August 2009, the sitcom won the best comedy series TCA award and Jim Parsons (Sheldon) won the award for individual achievement in comedy.[196] In 2010, the show won the People's Choice Award for Favorite Comedy, while Parsons won a Primetime Emmy Award for Outstanding Lead Actor in a Comedy Series.[197] On January 16, 2011, Parsons was awarded a Golden Globe for Best Performance by an Actor in a Television Series – Comedy or Musical, an award that was presented by co-star Kaley Cuoco. On September 18, 2011, Parsons was again awarded an Emmy for Best Actor in a Comedy Series. On January 9, 2013, the show won People's Choice Award for Favorite Comedy for a second time. August 25, 2014, Jim Parsons was awarded an Emmy for Best Actor in a Comedy Series.[198] The Big Bang Theory also won the 2016 People's Choice Awards for under Favorite TV Show and Favorite Network TV Comedy with Jim Parsons winning Favorite Comedic TV Actor.[199] On January 20, 2016, The Big Bang Theory also won the International category at the UK's National Television Awards.[200]


On March 16, 2014, a Lego Ideas project[201] portraying the living room scene in Lego style with the main cast as minifigures reached 10,000 supporters on the platform, which qualified it to be considered as an official set by the Lego Ideas review board. On November 7, 2014, Lego Ideas approved the design and began refining it. The set was released in August 2015, with an exclusive pre-sale taking place at the San Diego Comic-Con International.


  1. During season 5, episode 21 ("The Hawking Excitation"), Raj states that Sheldon had begged three times before: He begged the Fox network not to cancel Firefly, he begged TNT to cancel Babylon 5, and when he got food poisoning, he begged a deity he does not believe in to end his life quickly.


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