The Big Bang Theory - Wikipedia 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 Starring Johnny Galecki Jim Parsons Kaley Cuoco Simon Helberg Kunal Nayyar Sara Gilbert Mayim Bialik Melissa Rauch Kevin Sussman Laura Spencer Theme music composer Barenaked Ladies Opening theme `` Big Bang Theory Theme '' Country of origin United States Original language ( s ) English No. of seasons 11 No. of episodes 255 ( list of episodes ) Production Executive producer ( s ) Chuck Lorre Steven Molaro Bill Prady Eric Kaplan 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 Release Original network CBS Picture format HDTV 1080i Audio format Dolby Digital 5.1 Original release September 24, 2007 ( 2007 - 09 - 24 ) -- present ( present ) Chronology Related shows Young Sheldon External links Website The Big Bang Theory 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. In March 2017, the series was renewed for two additional seasons, bringing its total to twelve, and running through the 2018 -- 19 television season. The eleventh season premiered on September 25, 2017. 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 men are contrasted for comic effect with Penny 's social skills and common sense. Over time, supporting characters have been promoted to starring roles : Leslie Winkle, a physicist who dated Leonard and Howard ; neuroscientist Amy Farrah Fowler, who joins the group after being matched to Sheldon on a dating website ( and later becomes Sheldon 's girlfriend and fiancée ) ; Bernadette Rostenkowski, Howard 's wife ( previously his girlfriend ), a microbiologist and former part - time waitress alongside Penny ; Stuart Bloom, the cash - strapped owner of the comic book store the characters often visit ; and Emily Sweeney, a dermatologist who dated Raj. The Big Bang Theory received mixed reviews from critics throughout its first season, but reception was more favorable in the second and third seasons. More recent seasons have seen a return to a lukewarm reception, with the show being criticised for a decline in comedic quality. The show was nominated for the Emmy Award for Outstanding Comedy Series from 2011 to 2014 and won the Emmy Award for Outstanding Lead Actor in a Comedy Series four times for Jim Parsons. It has so far won 7 Emmy awards from 46 nominations. Parsons also won the Golden Globe for Best Actor in a Television Comedy Series in 2011. The series has so far won 56 awards from 216 nominations. It has also spawned a prequel series in 2017 based on Parsons ' character, Sheldon Cooper, named Young Sheldon which originally aired on CBS. Contents 1 Production 1.1 Theme song 1.2 Actors ' salaries 2 Cast and characters 2.1 Scientist cameos 3 Episodes 4 Recurring themes and elements 4.1 Science 4.2 Science fiction media 4.3 Leonard and Penny 's relationship 4.4 Sheldon and Amy 's relationship 4.5 Soft Kitty 4.6 Howard 's mother 4.7 Vanity cards 5 Reception 5.1 Critical reception 5.2 U.S. standard ratings 5.3 UK distribution and ratings 5.4 Canadian ratings 6 Broadcast 6.1 Syndication 6.2 Online media 7 Home media 8 Awards and nominations 9 Merchandise 10 Offshoots 10.1 Plagiarized series 10.2 Spin - off series 11 Notes 12 References 13 External links Production Series ' logo used for print. The show 's pilot episode premiered on September 24, 2007. This was the second pilot produced for the show. A different pilot was produced for the 2006 -- 07 television season but never aired. The structure of the original unaired pilot 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, a longtime figure in episodic television as producer, director and actor. Althea ( Vernee Watson ) was a character featured in both pilots and the first series episode. Two female leads were Canadian actress Amanda Walsh as Katie, `` a street - hardened, tough - as - nails woman with a vulnerable interior, '' 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 its theme song. Although the original pilot was not picked up, its creators were given an opportunity to retool it 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 never has officially been 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... '' 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. 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. The show is filmed in front of a live audience, and is produced by Warner Bros. Television and Chuck Lorre Productions. 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 and ultimately only 17 episodes were produced for the first season. 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. With increasing ratings, the show received a two - year renewal through the 2010 -- 11 season in 2009. In 2011, the show was picked up for three more seasons. In March 2014, the show was renewed again for three more years through the 2016 -- 17 season. This marks the second time the series has gained a three - year renewal. In March 2017, the series was renewed for two additional seasons, bringing its total to 12, and running through the 2018 -- 19 television season. 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. 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. '' Several of the actors in The Big Bang Theory previously worked together on the sitcom 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, and at the concert improvised a freestyle rap about the origins of the universe. Lorre and Prady phoned him 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 producers favored songs by other artists, 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. Although some unofficial pages identify the song title as `` History of Everything, '' the cover art for the single identifies the title as `` Big Bang Theory Theme. '' A music video also was released via special features on The Complete Fourth Season DVD and Blu - ray set. The theme was included on the band 's greatest hits album, Hits from Yesterday & the Day Before, released on September 27, 2011. 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. 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. 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. By season seven, Galecki, Parsons, and Cuoco were also receiving 0.25 % of the series ' back - end money. Before production began on the eighth season, the three plus Helberg and Nayyar, looked to renegotiate new contracts, with Galecki, Parsons, and Cuoco seeking around $1 million per episode, as well as more back - end money. 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. Helberg and Nayyar were also able to renegotiate 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. By season 10, Helberg and Nayyar reached the $1 million per episode parity with Parsons, Galecki, and Cuoco, due to a clause in their deals signed in 2014. In March 2017, the main cast members ( Galecki, Parsons, Cuoco, Helberg, and Nayyar ) took a 10 % pay cut to allow Bialik and Rauch an increase in their earnings. This put Galecki, Parsons, Cuoco, Helberg and Nayyar at $900,000 per episode, with Parsons, Galecki, and Helberg also receiving overall deals with Warner Bros. Television. By the end of April, Bialik and Rauch had signed deals to earn $500,000 per episode, each, with the deals also including a separate development component for both actors. The deal was an increase from the $175,000 -- $200,000 the duo had been making per episode. Cast and characters This section describes a work or element of fiction in a primarily in - universe style. Please help rewrite it to explain the fiction more clearly and provide non-fictional perspective. ( February 2017 ) Main article : List of The Big Bang Theory 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 : Johnny Galecki as Leonard Hofstadter : An experimental physicist with an IQ of 173, who received his PhD when he was 24 years old. Leonard is a nerd who loves video games, comic books, and Dungeons & Dragons. Leonard is the straight man of the series, in which he shares an apartment in Pasadena, CA, with Sheldon. Leonard is smitten with his new neighbor Penny when they first meet, and they eventually marry. Jim Parsons as Sheldon Cooper : Originally from Galveston, Texas, Sheldon was a child prodigy with an eidetic memory who began college at the age of eleven, and earned a PhD at age sixteen. He is a theoretical physicist researching quantum mechanics and string theory, and despite his IQ of 187, he finds many routine aspects of social situations difficult to grasp. He is determined to have his own way, continually boasts of his intelligence, and has an extremely ritualized way of living. Despite these quirks, he begins a relationship with Amy Farrah Fowler, they are now engaged to marry. Kaley Cuoco as Penny : An aspiring actress from Omaha, Nebraska. Penny moves in across the hall from Sheldon and Leonard. She waits and occasionally tends the bar at the Cheesecake Factory. After giving up hope of becoming a successful actress, Penny becomes a pharmaceutical sales representative. Penny becomes friends with Bernadette and Amy, and they often hang out in each other 's apartments. Penny and Leonard form a relationship and eventually marry. Simon Helberg as Howard Wolowitz : An aerospace engineer. Howard is Jewish and lives with his mother, Debbie ( Carol Ann Susi ). Unlike Sheldon, Leonard, Raj, Bernadette and Amy, Howard does not hold a doctorate. He goes into space, training as an astronaut and serving as a payload specialist. Howard initially fancies himself as a womanizer, but he later starts dating Bernadette, and they get engaged and married. Howard also has a tendency to waste money on toys and argues with Bernadette because of his oddly low income as an engineer and her high income as a pharmaceutical biochemist. Kunal Nayyar as Rajesh Koothrappali : A particle astrophysicist originally from New Delhi, India. Raj is initially unable to talk to women unless he drinks alcohol. Raj also has very feminine tastes and often takes on a stereotypical female role. Raj later dates Lucy ( Kate Micucci ), who also suffers from social anxiety, but it eventually ends ; he later speaks to Penny without alcohol and thus overcomes his selective mutism. He begins dating Emily and their relationship later becomes exclusive. Raj also has a Yorkshire Terrier named Cinnamon. These actors were first credited as guest stars and later promoted to main cast : Sara Gilbert as Leslie Winkle ( recurring season 1, starring season 2, guest seasons 3, 9 ) : A physicist who works in the same lab as Leonard. In appearance, she is essentially Leonard 's female counterpart and has conflicting scientific theories with Sheldon. Leslie has casual sex with Leonard and later Howard. Gilbert was promoted to a main cast member during the second season but resumed guest star status because producers could not come up with enough material for the character. Gilbert returned to The Big Bang Theory for its 200th episode. Melissa Rauch as Bernadette Rostenkowski - Wolowitz ( recurring season 3, starring seasons 4 -- ) : A young woman who initially is a co-worker at The Cheesecake Factory with Penny to pay her way through graduate school, where she is studying microbiology. Bernadette is introduced to Howard by Penny ; at first, they do not get along, apparently having nothing in common. They date and later get engaged and married. Although generally a sweet and good - natured person, Bernadette has a short fuse and can be vindictive and lash out when provoked. Mayim Bialik as Amy Farrah Fowler ( guest star season 3, starring seasons 4 -- ) : A woman selected by an online dating site as Sheldon 's perfect mate. Amy is from Glendale, CA. While she and Sheldon initially share social cluelessness, after befriending Penny and Bernadette she eventually becomes more interested in social and romantic interaction. Her relationship with Sheldon slowly progresses to the point at which Sheldon considers her his girlfriend. Amy believes she and Penny are best friends, a sentiment that Penny does not initially share. Amy has a Ph. D. in neurobiology. Kevin Sussman as Stuart Bloom ( recurring seasons 2 -- 5, 7, starring seasons 6, 8 -- ) : A mild - mannered, under - confident owner of a comic book store. A competent artist, Stuart is a graduate of the prestigious Rhode Island School of Design, and though he is socially awkward he possesses slightly better social skills. Stuart implies he is in financial trouble and that the comic book store now also is his home. He is later invited to join the guys ' group while Howard is in space. Stuart gets a new job caring for Howard 's mother later. After Mrs. Wolowitz 's death, Stuart continues to live in her home, along with Howard and Bernadette, until he finds a place of his own. Laura Spencer as Emily Sweeney ( recurring seasons 7 -- 8, starring season 9 ) : A dermatologist at Huntington Hospital. Emily went to Harvard and delights in the macabre and states that she likes her job because she can cut things with knives. Prior to meeting Raj, Emily was set up on a blind date with Howard. After finding Emily 's online dating profile, Raj has Amy contact her as his wingman instead. Their relationship becomes exclusive, but Raj later breaks up with Emily when he becomes infatuated with the bartender Claire ( Alessandra Torresani ). Scientist cameos See also : List of The Big Bang Theory characters § Guest stars appearing as themselves 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 the second season. Theoretical physicist Brian Greene appeared in the fourth season, as well as astrophysicist, science populizer, and physics outreach specialist Neil deGrasse Tyson. Cosmologist Stephen Hawking made a short guest appearance in the fifth - season episode ; in the eighth season, Hawking video conferences with Sheldon and Leonard, and makes another appearance in the 200th episode. In the fifth and sixth seasons, NASA astronaut Michael J. Massimino played himself multiple times in the role of Howard 's fellow astronaut. Bill Nye appeared in the seventh season, and Elon Musk made an appearance in the ninth season. Episodes Main article : List of The Big Bang Theory episodes Season Episodes Originally aired Nielsen ratings First aired Last aired Viewers ( millions ) Viewers rank 18 -- 49 rating / share 18 -- 49 rank 17 September 24, 2007 ( 2007 - 09 - 24 ) May 19, 2008 ( 2008 - 05 - 19 ) 8.31 68 3.3 / 8 46 23 September 22, 2008 ( 2008 - 09 - 22 ) May 11, 2009 ( 2009 - 05 - 11 ) 10.03 40 N / A N / A 23 September 21, 2009 ( 2009 - 09 - 21 ) May 24, 2010 ( 2010 - 05 - 24 ) 14.22 12 5.3 / 13 5 24 September 23, 2010 ( 2010 - 09 - 23 ) May 19, 2011 ( 2011 - 05 - 19 ) 13.21 13 4.4 / 13 7 5 24 September 22, 2011 ( 2011 - 09 - 22 ) May 10, 2012 ( 2012 - 05 - 10 ) 15.82 8 5.5 / 17 6 6 24 September 27, 2012 ( 2012 - 09 - 27 ) May 16, 2013 ( 2013 - 05 - 16 ) 18.68 6.2 / 19 7 24 September 26, 2013 ( 2013 - 09 - 26 ) May 15, 2014 ( 2014 - 05 - 15 ) 19.96 6.2 / 20 8 24 September 22, 2014 ( 2014 - 09 - 22 ) May 7, 2015 ( 2015 - 05 - 07 ) 19.05 5.6 / 17 9 24 September 21, 2015 ( 2015 - 09 - 21 ) May 12, 2016 ( 2016 - 05 - 12 ) 20.36 5.8 / 19 10 24 September 19, 2016 ( 2016 - 09 - 19 ) May 11, 2017 ( 2017 - 05 - 11 ) 18.99 4.9 / 19 11 24 September 25, 2017 ( 2017 - 09 - 25 ) May 10, 2018 ( 2018 - 05 - 10 ) 18.63 4.4 5 Recurring themes and elements Science 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. When Leonard joins Sheldon, Raj, and Howard on a three - month Arctic research trip, it separates Leonard and Penny at a time when 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. Sheldon and Amy also briefly end their relationship after an argument over which of their fields is superior. David Saltzberg, who has a Ph. D. in physics, has served as the science consultant for the show for six seasons and attends every taping. While Saltzberg knows physics, he sometimes needs assistance from Mayim Bialik, who has a Ph. D. in neuroscience. 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. Science fiction Media Star Trek : The Next Generation actor Wil Wheaton has a recurring role as a fictional version of himself on the show. 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 ? ! '' ). 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, 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 do n'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. 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 '' 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. 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. DC Comics announced that, to promote its comics, the company will sponsor Sheldon wearing Green Lantern T - shirts. Various games have been featured, as well as referenced, on the series ( e.g. World of Warcraft, Halo, Mario, Donkey Kong, etc. ), including fictional games like Mystic Warlords of Ka'a ( which became a reality in 2011 ) 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. Meanwhile, Penny dates a series of muscular, attractive, unintelligent, and insensitive jocks. 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 can not 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. `` 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 fifth 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. In the season eleven premiere, Sheldon proposes to Amy and she accepts. Soft Kitty Main article : Soft Kitty In the show, the song Soft Kitty was described by Sheldon as a song sung by his mother when he was ill. Its repeated use in the series popularized the song. A scene depicting the origin of the song in Sheldon 's childhood is depicted in an episode of Young Sheldon, which aired on February 1, 2018. It shows Sheldon 's mother Mary singing the song to her son, who is suffering with the flu. 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. 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. 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, and Sheldon to refer to their relationship as Oedipal. 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. Reception Critical reception Initial reception for the series was mixed. The review aggregation website Rotten Tomatoes reported a 55 % approval rating for the first season based on reviews from 22 critics, with an average rating of 5.18 / 10. The website 's critical consensus reads, `` The Big Bang Theory brings a new class of character to mainstream television, but much of the comedy feels formulaic and stiff. '' On Metacritic, the season holds a score of 57 out of 100, based on reviews from 23 critics, indicating `` mixed or average reviews ''. Later seasons received more acclaim and in 2013, TV Guide ranked the series # 52 on its list of the 60 Best Series of All Time. US 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. 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 ). 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. 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, 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, and was third in total viewers, trailing NCIS and Sunday Night Football. 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. 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. 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. The Big Bang Theory did not place first in syndication ratings for the 2013 -- 14 television season, beaten out by Judge Judy. Season Timeslot ( ET ) Episodes First aired Last aired TV season Rank Avg. viewers ( millions ) 18 -- 49 rating ( average ) Date Viewers ( millions ) Date Viewers ( millions ) Monday 8 : 30pm ( 1 -- 8 ) Monday 8 : 00pm ( 9 -- 17 ) 17 September 24, 2007 ( 2007 - 09 - 24 ) 9.52 May 19, 2008 ( 2008 - 05 - 19 ) 7.34 2007 -- 08 68 8.31 3.3 / 8 ( 46 ) Monday 8 : 00 pm 23 September 22, 2008 ( 2008 - 09 - 22 ) 9.36 May 11, 2009 ( 2009 - 05 - 11 ) 9.81 2008 -- 09 40 10.03 N / A Monday 9 : 30 pm 23 September 21, 2009 ( 2009 - 09 - 21 ) 12.96 May 24, 2010 ( 2010 - 05 - 24 ) 14.78 2009 -- 10 12 14.22 5.3 / 13 ( 5 ) Thursday 8 : 00pm 24 September 23, 2010 ( 2010 - 09 - 23 ) 14.04 May 19, 2011 ( 2011 - 05 - 19 ) 11.30 2010 -- 11 13 13.21 4.4 / 13 ( 7 ) 5 24 September 22, 2011 ( 2011 - 09 - 22 ) 14.30 May 10, 2012 ( 2012 - 05 - 10 ) 13.72 2011 -- 12 8 15.82 5.5 / 17 ( 6 ) 6 24 September 27, 2012 ( 2012 - 09 - 27 ) 15.66 May 16, 2013 ( 2013 - 05 - 16 ) 15.48 2012 -- 13 18.68 6.2 / 19 ( 2 ) 7 24 September 26, 2013 ( 2013 - 09 - 26 ) 18.99 May 15, 2014 ( 2014 - 05 - 15 ) 16.73 2013 -- 14 19.96 6.2 / 20 ( 2 ) 8 Monday 8 : 00pm ( 1 -- 6 ) Thursday 8 : 00pm ( 7 -- 24 ) 24 September 22, 2014 ( 2014 - 09 - 22 ) 18.08 May 7, 2015 ( 2015 - 05 - 07 ) 14.64 2014 -- 15 19.05 5.6 / 17 ( 4 ) 9 24 September 21, 2015 ( 2015 - 09 - 21 ) 18.20 May 12, 2016 ( 2016 - 05 - 12 ) 14.73 2015 -- 16 20.36 5.8 / 19 ( 3 ) 10 Monday 8 : 00pm ( 1 -- 5 ) Thursday 8 : 00pm ( 6 -- 24 ) 24 September 19, 2016 ( 2016 - 09 - 19 ) 15.82 May 11, 2017 ( 2017 - 05 - 11 ) 12.99 2016 -- 17 18.99 4.9 / 19 ( 3 ) 11 24 September 25, 2017 ( 2017 - 09 - 25 ) 17.65 May 10, 2018 ( 2018 - 05 - 10 ) 15.51 2017 -- 18 18.63 4.4 ( 5 ) 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. 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. 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. 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. The eighth season premiered on E4 on October 23, 2014 at 8 : 30 p.m. 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. Netflix UK & Ireland announced on February 13, 2016 that seasons 1 -- 8 would be available to stream from February 15, 2016. 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. Broadcast 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. On February 14, 2008, the series debuted in the United Kingdom on channels E4 and Channel 4. 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. On January 22, 2018, it was announced that Nine had acquired the rights to Season 1 -- 8. Syndication 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 former local sister station in Atlanta also holds local weeknight rights to the series ). 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 ''. 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. Full episodes are available at tv.com, while short clips and recently aired full episodes are available on cbs.com. In Canada, recent episode ( s ) and pictures are available on CTV.ca. Additionally in Canada, the first six seasons are available for streaming on Bell Media 's CraveTV. 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 episodes Additional Information Region 1 Region 2 Region 4 The Complete First Season September 2, 2008 January 12, 2009 April 3, 2009 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 October 19, 2009 March 3, 2010 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 September 27, 2010 October 13, 2010 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 September 26, 2011 October 5, 2011 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 September 3, 2012 October 3, 2012 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 September 2, 2013 October 11, 2013 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 September 8, 2014 September 17, 2014 24 String Theory Serenade James Earl Jones : The Un-Conventional Guest Star BBTea Time The Big Bang Theory 's May 4 The Convention Conundrum The Big Cendrowski 2013 Comic - Con Panel Gag Reel The Complete Eighth Season September 15, 2015 September 14, 2015 September 16, 2015 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 August 29, 2016 August 31, 2016 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 at their time of release in 2008 and 2009. Starting with the release of the third season in 2010 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, marking the first time that all episodes were available on the Blu - ray disc format. Awards and nominations Main article : List of awards and nominations received by The Big Bang Theory In August 2009, the sitcom won the best comedy series TCA award and Jim Parsons ( Sheldon ) won the award for individual achievement in comedy. 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. 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 the second time. August 25, 2014, Jim Parsons was awarded an Emmy for Best Actor in a Comedy Series. 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. On January 20, 2016, The Big Bang Theory also won the International category at the UK 's National Television Awards. Merchandise On March 16, 2014, a Lego Ideas project portraying the living room scene in Lego style with the main cast as mini-figures 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. Offshoots Plagiarized series 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. 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. However, no legal action was required to end production of the other show : as soon as it became known that the show was unlicensed, the actors quit and the producers canceled it. 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 did n't know it was n't the case, so when the creators of The Big Bang Theory started talking about the show, I was embarrassed. I ca n't understand why our people first do, and then think. I consider this to be the rock bottom of my career. And I do n't want to take part in a stolen show ''. Spin - off series Main article : Young Sheldon In November 2016, it was reported that CBS was in negotiations to create a spin - off of The Big Bang Theory centered on Sheldon as a young boy. The prequel series, described as `` a Malcolm in the Middle-esque single - camera family comedy '' would be executive - produced by Lorre and Molaro, with Prady expected to be involved in some capacity, and intended to air in the 2017 -- 18 season alongside The Big Bang Theory. The initial idea for the series came from Parsons, who passed it along to The Big Bang Theory producers. In early March 2017, Iain Armitage was cast as the younger Sheldon, as well as Zoe Perry as his mother, Mary Cooper. Perry is the real - life daughter of Laurie Metcalf, who portrays Mary Cooper on The Big Bang Theory. On March 13, 2017, CBS ordered the spin - off Young Sheldon series. Jon Favreau directed and executive produced the pilot. Created by Lorre and Molaro, the series follows 9 - year - old Sheldon Cooper as he attends high school in East Texas. Alongside Armitage as 9 - year - old Sheldon Cooper and Perry as Mary Cooper, Lance Barber stars as George Cooper, Sheldon 's father ; Raegan Revord stars as Missy Cooper, Sheldon 's twin sister ; and Montana Jordan as George Cooper Jr., Sheldon 's older brother. Jim Parsons reprises his role as adult Sheldon Cooper, as narrator for the series. Parsons, Lorre, Molaro and Todd Spiewak will also serve as executive producers on the series, for Chuck Lorre Productions, Inc. in association with Warner Bros. Television. The show 's pilot episode premiered on September 25, 2017. Subsequent weekly episodes began airing on November 2, 2017 following the broadcast of the 237th episode of The Big Bang Theory. Notes Jump up ^ 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. References Jump up ^ `` Big Bang Theory Theme -- Single ''. iTunes. Retrieved May 9, 2011. Jump up ^ `` Big Bang Theory Theme ''. Amazon.co.uk. Retrieved September 2, 2011. Jump up ^ `` The Big Bang Theory : Cast & Details ''. TV Guide. Retrieved January 28, 2013. Jump up ^ `` CBS Announces New 2017 -- 2018 Fall Schedule ''. The Futon Critic. May 17, 2017. Retrieved May 30, 2017. ^ Jump up to : Gary Strauss ( April 11, 2007 ). `` There 's a science to CBS ' Big Bang Theory ''. USA Today. Retrieved November 7, 2008. ^ Jump up to : Scott D. Pierce ( October 8, 2007 ). `` He 's a genius ''. Deseret News. Retrieved December 11, 2008. 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Jump up ^ Andreeva, Nellie ( September 15, 2010 ). `` EXCLUSIVE : ' Big Bang Theory ' Stars Score Huge Paydays After Hardball Bargaining ; Jim Parsons Told ' Take It Or Leave It ' Today ''. Deadline Hollywood. Retrieved October 1, 2011. That effectively adds another $50,000 to their per - episode paycheck over the life of the deal. Jump up ^ Andreeva, Nellie ( September 18, 2013 ). `` ' Big Bang ' Co-Stars Mayim Bialik & Melissa Rauch Get Major Salary Bumps As Show Faces License Fee & More Cast Negotiations ''. Deadline Hollywood. Retrieved July 19, 2014. Jump up ^ Andreeva, Nellie ( July 16, 2014 ). `` ' The Big Bang Theory ' Production Start In Limbo As Cast Contract Negotiations Drag On ''. Deadline Hollywood. Retrieved July 19, 2014. Jump up ^ Andreeva, Nellie ( August 4, 2014 ). `` ' Big Bang Theory ' Stars Jim Parsons, Johnny Galecki & Kaley Cuoco Close Big New Deals ''. Deadline Hollywood. Retrieved August 5, 2014. 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I move our relationship terminate immediately Jump up ^ Goldberg, Lesley ( May 17, 2013 ). `` ' Big Bang Theory ' : A Behind the Scenes Diary of the Sweet Season 6 Finale ''. The Hollywood Reporter. Retrieved May 19, 2013. ^ Jump up to : Watercutter, Angela ( September 22, 2011 ). `` TV Fact - Checker : Dropping Science on The Big Bang Theory ''. wired.com. Retrieved May 31, 2012. Jump up ^ `` The Bath Item Gift Hypothesis ''. The Big Bang Theory. Season 2. Episode 11. December 15, 2008. Event occurs at 18 : 00. CBS. Jump up ^ `` The Russian Rocket Reaction ''. The Big Bang Theory. Season 5. Episode 5. October 13, 2011. Event occurs at 19 : 48. CBS. Jump up ^ `` The Toast Derivation ''. The Big Bang Theory. Season 4. Episode 17. February 24, 2011. 20 : 47 minutes in. CBS. Jump up ^ `` The Large Hadron Collision ''. The Big Bang Theory. Season 3. Episode 15. February 8, 2010. 12 : 02 minutes in. CBS. Jump up ^ `` The Hofstadter Isotope ''. The Big Bang Theory. Season 2. Episode 20. 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External links The Big Bang Theory portal Television portal Comedy portal Find more aboutThe Big Bang Theoryat Wikipedia 's sister projects Media from Wikimedia Commons News from Wikinews Quotations from Wikiquote Official website The Big Bang Theory on IMDb The Big Bang Theory at Rotten Tomatoes The Big Bang Theory Characters Leonard Hofstadter Sheldon Cooper Penny Howard Wolowitz Raj Koothrappali Episodes Season 1 `` Pilot '' Season 2 `` The Terminator Decoupling '' Season 3 `` The Jiminy Conjecture '' Season 4 `` The Cruciferous Vegetable Amplification '' `` The Hot Troll Deviation '' `` The Love Car Displacement '' `` The Toast Derivation '' `` The Roommate Transmogrification '' Season 5 `` The Skank Reflex Analysis '' `` The Infestation Hypothesis '' `` The Wiggly Finger Catalyst '' `` The Russian Rocket Reaction '' `` The Rhinitis Revelation '' `` The Good Guy Fluctuation '' `` The Isolation Permutation '' `` The Flaming Spittoon Acquisition '' `` The Shiny Trinket Maneuver '' `` The Recombination Hypothesis '' `` The Beta Test Initiation '' `` The Werewolf Transformation '' `` The Hawking Excitation '' `` The Stag Convergence '' `` The Countdown Reflection '' Season 6 `` The Fish Guts Displacement '' `` The Santa Simulation '' `` The Egg Salad Equivalency '' Season 7 `` The Hofstadter Insufficiency '' `` The Convention Conundrum '' Season 8 `` The Locomotion Interruption '' Season 9 Season 10 Season 11 Recurring concepts `` Soft Kitty '' Related articles Awards and nominations Bazinga ( jellyfish ) Euglossa bazinga Young Sheldon Portal Book TCA Award for Outstanding Achievement in Comedy The Cosby Show, season 1 ( 1985 ) The Cosby Show, season 2 ( 1986 ) It 's Garry Shandling 's Show, season 1 ( 1987 ) Frank 's Place, season 1 / The Wonder Years, season 1 ( 1988 ) Murphy Brown, season 1 ( 1989 ) The Simpsons, season 1 ( 1990 ) Murphy Brown, season 3 ( 1991 ) Seinfeld, season 3 ( 1992 ) Seinfeld, season 4 ( 1993 ) Frasier, season 1 ( 1994 ) Frasier, season 2 ( 1995 ) Frasier, season 3 ( 1996 ) The Larry Sanders Show, season 5 ( 1997 ) The Larry Sanders Show, season 6 ( 1998 ) Sports Night, season 1 ( 1999 ) Malcolm in the Middle, season 1 ( 2000 ) Malcolm in the Middle, season 2 ( 2001 ) The Bernie Mac Show, season 1 ( 2002 ) The Daily Show with Jon Stewart, season 7 / season 8 ( 2003 ) Arrested Development, season 1 ( 2004 ) Arrested Development, season 2 ( 2005 ) The Office, season 2 ( 2006 ) The Office, season 3 ( 2007 ) 30 Rock, season 2 ( 2008 ) The Big Bang Theory, season 2 ( 2009 ) Modern Family, season 1 ( 2010 ) Modern Family, season 2 ( 2011 ) Louie, season 2 ( 2012 ) The Big Bang Theory, season 6 / Parks and Recreation, season 5 ( 2013 ) Louie, season 4 / Veep, season 3 ( 2014 ) Inside Amy Schumer, season 3 ( 2015 ) Black - ish, season 2 ( 2016 ) Atlanta, season 1 ( 2017 ) Satellite Award for Best Television Series -- Musical or Comedy The Larry Sanders Show ( 1996 ) Frasier ( 1997 ) Ellen ( 1998 ) Action ( 1999 ) Sex and the City ( 2000 ) Sex and the City ( 2001 ) The Bernie Mac Show ( 2002 ) Arrested Development ( 2003 ) Desperate Housewives ( 2004 ) The Daily Show with Jon Stewart ( 2005 ) Ugly Betty ( 2006 ) Pushing Daisies ( 2007 ) Tracey Ullman 's State of the Union ( 2008 ) Glee ( 2009 ) The Big C ( 2010 ) It 's Always Sunny in Philadelphia ( 2011 ) The Big Bang Theory ( 2012 ) Orange Is the New Black ( 2013 ) Transparent ( 2014 ) Silicon Valley ( 2015 ) Silicon Valley ( 2016 ) GLOW ( 2017 ) Critics ' Choice Television Award for Best Comedy Series Modern Family, season 2 ( 2011 ) Community, season 3 ( 2012 ) The Big Bang Theory, season 6 ( 2013 ) Orange Is the New Black, season 1 ( 2014 ) Silicon Valley, season 2 ( 2015 ) Master of None, season 1 ( 2016 ) Silicon Valley, season 3 ( 2016 ) The Marvelous Mrs. Maisel, season 1 ( 2017 ) Teen Choice Award for Choice Comedy Series Friends ( 1999 -- 2004 ) Gilmore Girls ( 2005 ) High School Musical ( 2006 ) awarded as Choice TV Comedy / Musical Show Hannah Montana ( 2007 -- 09 ) Glee ( 2010 -- 13 ) The Big Bang Theory ( 2014 -- 15 ) Fuller House ( 2016 -- 17 ) CBS programming ( current and upcoming ) Primetime 48 Hours ( since 1988 ) 60 Minutes ( since 1968 ) The Amazing Race ( since 2001 ) The Big Bang Theory ( since 2007 ) Big Brother ( since 2000 ) Blue Bloods ( since 2010 ) Bull ( since 2016 ) Celebrity Big Brother ( since 2018 ) Celebrity Undercover Boss ( since 2018 ) Code Black ( since 2015 ) Criminal Minds ( since 2005 ) Elementary ( since 2012 ) Hawaii Five - 0 ( since 2010 ) Hunted ( since 2017 ) Instinct ( since 2018 ) Life in Pieces ( since 2015 ) Living Biblically ( since 2018 ) MacGyver ( since 2016 ) Madam Secretary ( since 2014 ) Man with a Plan ( since 2016 ) Mom ( since 2013 ) NCIS ( since 2003 ) NCIS : Los Angeles ( since 2009 ) NCIS : New Orleans ( since 2014 ) Ransom ( since 2017 ) Salvation ( since 2017 ) SEAL Team ( since 2017 ) Survivor ( since 2000 ) S.W.A.T. 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Question: the original cast of the big bang theory
Answer: Johnny Galecki as Leonard Hofstadter