The Big Bang Theory: Season 6 (2012 - 2013)
- Season 6 Episode 24: The Bon Voyage Reaction
When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.
- Season 6 Episode 23: The Love Spell Potential
Amy and Sheldon's relationship takes a surprising turn during a game of 'Dungeons & Dragons'; Lucy and Koothrappali have an awkward date.
- Season 6 Episode 22: The Proton Resurgence
Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.
- Season 6 Episode 21: The Closure Alternative
Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.
- Season 6 Episode 20: The Tenure Turbulence
The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.
- Season 6 Episode 19: The Closet Reconfiguration
Bernadette and Howard host a dinner party, but as it falls on Sheldon's Thai food night, he opts to bring his own dinner. As punishment for his lack of manners, the gang decides he should organise Wolowitz's cluttered closet, but he discovers an unopened letter from Howard's father, who hasn't made contact in years
- Season 6 Episode 18: The Contractual Obligation Implementation
While the girls go to Disneyland and get made-up as princesses, the guys have to promote science as a career option for women at Howard's old middle school. Meanwhile, Raj and Lucy have their first date in a library where they text instead of speaking to each other
- Season 6 Episode 17: The Monster Isolation
Raj is upset when Lucy runs away in the middle of their date, leaving the gang to cheer him up. However, when Howard bumps into her she admits how shy she actually is and rearranges another outing with Raj. Meanwhile, Sheldon asks Penny to help with a new episode of Fun with Flags, and because he is impressed by her acting ability, the friends go to see her in a performance of A Streetcar Named Desire
- Season 6 Episode 16: The Tangible Affection Proof
Leonard and Penny celebrate Valentine's Day, but their evening takes a turn for the worse when the latter's ex-boyfriend proposes to his girlfriend in the same restaurant. Meanwhile, Sheldon enlists the help of his assistant Alex to find the perfect gift for Amy
- Season 6 Episode 15: The Spoiler Alert Segmentation
Leonard moves in with Penny while he is mad at Sheldon. However, this leads Amy to suggest she would be the perfect roommate for Dr Cooper as she knows him so well and he wouldn't have to train anyone else. Meanwhile, Howard goes on a trip to Las Vegas with Bernadette and asks Raj to keep an eye on his mother while he is away
- Season 6 Episode 14: The Cooper/Kripke Inversion
Sheldon is furious when the university forces him to work with Kripke, while Howard's hobby lands him in financial trouble, but that doesn't stop him and Raj getting expensive action figures of themselves made, much to Bernadette's disapproval
- Season 6 Episode 13: The Bakersfield Expedition
The guys become stranded in the middle of nowhere when Leonard's car is stolen en route to the Bakersfield comic convention. Meanwhile, back at home, the women try to figure out why the guys are so fascinated with comic-books
- Season 6 Episode 12: The Egg Salad Equivalency
Leonard is surprised when he realises Alex is attracted to him - but Sheldon is annoyed that his new assistant is not focusing on her work and attempts to get advice from the girls about what to do. However, the situation upsets Penny. Comedy, starring Johnny Galecki and Jim Parsons
- Season 6 Episode 11: The Santa Simulation
Leonard tries to get Sheldon into the Christmas mood by playing a game, but things do not go as planned when Sheldon reveals a childhood trauma. Raj goes out with the girls and reveals he had a crush on both Penny and Bernadette - but not Amy. Comedy, starring Johnny Galecki, Jim Parsons and Kaley CuocoThursday 23rd May 8:00pm EDT - WUSA (CBS)
- Season 6 Episode 10: The Fish Guts Displacement
As part of the relationship agreement, Sheldon reluctantly has to take care of Amy when she gets sick, but she loves the extra attention so much she pretends to remain in poor health. Elsewhere, Howard tries to get some tips on fishing from Penny when he and Bernadette go to visit her manly father
- Season 6 Episode 9: The Parking Spot Escalation
Sheldon feels undermined when his parking space at the university is allocated to Howard instead, and his determination to cling on to the spot causes a rift in the pair's friendship. However, the battle between the boys pales in comparison to that waged by Amy and Bernadette, whose disagreement on behalf of their significant others becomes increasingly personal. Comedy, starring Jim Parsons and Simon Helberg
- Season 6 Episode 8: The 43 Peculiarity
The friends try to solve the mystery of Sheldon's post-lunch activities, following him to a secret room where they discover how he chills out. Elsewhere, Leonard is jealous when Penny starts texting a classmate, but things quickly change when Alex gets flirty with him
- Season 6 Episode 7: The Habitation Configuration
When Amy and Wil Wheaton get into a fight while filming Fun with Flags, Sheldon pays the consequences of their fall out. He ends up going to Penny for advice and gets drunk, prompting him to confront the actor in a bid to make him apologise. Bernadette encourages Howard to move out of his mother's house
- Season 6 Episode 6: The Extract Obliteration
Sheldon upsets guest star Stephen Hawking when they play an online game of Words with Friends, until Howard advises him to let the scientist win. Elsewhere, Penny enrols in a college class, but decides to keep it a secret from Leonard. Comedy, starring Jim Parsons and Simon Helberg
- Season 6 Episode 5: The Holographic Excitation
Stuart and Raj host a Halloween party at the comic-book store, and Howard talks incessantly about his work on board the International Space Station, annoying his wife and friends. Penny and Sheldon have a steamy encounter at the lab. Comedy, guest starring Buzz Aldrin, with Johnny Galecki, Jim Parsons and Kaley CuocoMonday 20th May 9:00pm EDT - WUSA (CBS)
- Season 6 Episode 4: The Re-Entry Minimization
Howard returns from his space mission, but the welcome from his friends and family does not meet his expectations. His night alone with Bernadette goes badly, his mother ignores him, and he realises Stuart has taken his place as Koothrappali's best friend. On top of that, Sheldon, Amy, Leonard and Penny kick him out of their group game night. Comedy, starring Simon Helberg
- Season 6 Episode 3: The Higgs Boson Observation
Sheldon hires an attractive female assistant, but she becomes interested in Leonard, so Penny decides to mark her territory by sleeping with him. Meanwhile, Wolowitz starts to lose his mind when his return from space is delayed another week. Comedy, starring Jim Parsons
- Season 6 Episode 2: The Decoupling Fluctuation
Penny tells the girls she is unsure about her relationship with Leonard and is considering breaking up with him, but when Sheldon finds out, he tries his best to change her mind. On the International Space Station, Howard is being bullied by the other astronauts. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco
- Season 6 Episode 1: The Date Night Variable
Despite being on the International Space Station, Howard gets caught in a strange argument between Bernadette and his mother via video link. Elsewhere, Raj feels lonely while his best friend is away and ends up interfering with Sheldon's and Leonard's dates. Comedy, starring Simon Helberg
The Big Bang Theory: Season 5 (2011 - 2012)
- Season 5 Episode 24: Howard's Best Episodes: The Big Bang Theory: The Countdown Reflection
As Howard and his fellow astronauts sit in the space shuttle awaiting launch, he reflects on the tumultuous events of the previous few days, when he and Bernadette tried to get married before he went into space. Meanwhile, his friends witness the blast-off on TV at home
- Season 5 Episode 23: The Launch Acceleration
Howard tries to use his wedding as an excuse to avoid being sent into space but ends up accepting the mission. Amy plots to get Sheldon to take the next step in their relationship, while Leonard accidentally asks Penny to marry him after she agrees to sleep with him again
- Season 5 Episode 22: The Stag Convergence
Leonard, Sheldon and Raj organise a bachelor party for Howard, but stories about his sexual history are unwittingly revealed by Raj, and his friend has to persuade bride-to-be Bernadette not to call the wedding off. Comedy, starring Simon Helberg and Kunal Nayyar
- Season 5 Episode 21: The Hawking Excitation
Wolowitz is put in charge of looking after Stephen Hawking's wheelchair when the famous scientist comes to lecture at the university for a week. Sheldon is desperate to meet Hawking so Wolowitz takes advantage of his position of privilege to blackmail Sheldon into doing the most unpleasant tasks. Guest starring Stephen Hawking
- Season 5 Episode 20: The Transporter Malfunction
Penny buys Leonard and Sheldon some Star Trek action figures, but the duo refuse to remove them from the packaging in case their value is diminished. Elsewhere, Raj is desperate to find someone to accompany him to a wedding, and asks his parents to find him a date
- Season 5 Episode 19: The Weekend Vortex
Amy is disappointed when Sheldon breaks his promise to go with her to her aunt's birthday party, and instead decides to join the boys for a Star Wars video game marathon lasting the entire weekend. Comedy, starring Mayim Bialik and Jim Parsons
- Season 5 Episode 18: Sheldon's Best Episodes: The Big Bang Theory: The Werewolf Transformation
Sheldon refuses to get his hair cut after his regular barber passes away - a solitary change that causes chaos in the rest of his well-ordered life. Meanwhile, Howard undergoes a gruelling Nasa training programme in Houston, Texas, meaning he can only communicate with Bernadette via the internet
- Season 5 Episode 17: The Rothman Disintegration
Leonard, Raj and Howard devise a contest to decide whether Sheldon or Kripke should get Professor Rothman's vacant corner office. Meanwhile, Penny receives the gift of a painting from Amy to celebrate their friendship, but discreetly tries to dispose of it with help from Bernadette
- Season 5 Episode 16: The Vacation Solution
Sheldon uses his holidays to help Amy in her biology lab, and is soon moaning about the menial jobs he is given, until she asks him to dissect a brain. Penny grows curious about Leonard's feelings about marriage when Bernadette asks Howard to sign a pre-nuptial agreement
- Season 5 Episode 15: The Friendship Contraction
After Sheldon keeps Leonard awake all night, Leonard decides to break the Roommate Agreement with Sheldon. Howard makes preparations to go on a flight to the International Space Station and enlists Raj's help to ensure he gets a cool astronaut nickname
- Season 5 Episode 14: Sheldon's Best Episodes: The Big Bang Theory: The Beta Test Initiation
Leonard and Penny continue testing their rekindled relationship using an innovative system to report their discrepancies. Howard and Bernadette begin to worry when Raj starts treating his new phone like a person, while Sheldon and Amy try to achieve internet fame by creating a video podcast about flags
- Season 5 Episode 13: The Recombination Hypothesis
Leonard asks Penny out on a date, and they agree to give their relationship another chance. They soon begin to remember why it did not work out in the first place, but end up sleeping together anyway. The 100th episode of the comedy, starring Johnny Galecki and Kaley Cuoco
- Season 5 Episode 12: The Shiny Trinket Maneuver
Sheldon is uninterested in Amy's career, so Penny, Raj and Leonard try to make him understand that sometimes it benefits a relationship to pretend to care about a partner's accomplishments. Howard notices Bernadette is uncomfortable around children when she helps him perform a magic show at his nephew's birthday party
- Season 5 Episode 11: The Speckerman Recurrence
Leonard confronts the man who tormented him in high school, while Penny realises she did her fair share of bullying in the past and calls the people she targeted to apologise. Comedy, starring Johnny Galecki and Kaley Cuoco
- Season 5 Episode 10: The Flaming Spittoon Acquisition
Comic-book store owner Stuart asks Amy out on a date, forcing a jealous Sheldon to consider the future of his relationship with her. Meanwhile, the scientists become obsessed with an unusual new card game, and Penny organises a round of Twister. Comedy, starring Jim Parsons and Mayim Bialik
- Season 5 Episode 9: The Ornithophobia Diffusion
Leonard and Penny endure an awkward night at the cinema, with both of them insisting the outing is not a date. Meanwhile, a terrified Sheldon enlists his friends' help when a bird flies into his apartment, but his behaviour soon leaves them exasperated. Comedy, starring Johnny Galecki, Kaley Cuoco and Jim Parsons
- Season 5 Episode 8: The Isolation Permutation
Amy is hurt when she discovers Penny and Bernadette went shopping for bridesmaid dresses without. She first turns to a reluctant Sheldon for comfort and later tries to drown her sorrows Comedy, starring Mayim Balik and Katey Cuoco
- Season 5 Episode 7: The Good Guy Fluctuation
Leonard has doubts about his feelings for Priya when he kisses a girl he meets in the comic-book store, while the rest of the gang pulls pranks on Sheldon in celebration of Halloween. Comedy, starring Johnny Galecki and Jim Parsons
- Season 5 Episode 6: The Rhinitis Revelation
Sheldon's mother comes to visit and woos the gang, but he cannot help feeling jealous of all the attention she is receiving - until a bout of illness lays him low, and he suddenly sees the benefits of having her around. Comedy, starring Jim Parsons
- Season 5 Episode 5: The Russian Rocket Reaction
Sheldon's old adversary Wil Wheaton returns and invites everyone to a housewarming party. Leonard is eager to go, but Sheldon threatens to shun him if he attends. However, he soon changes his mind when he finds out that Star Trek: The Next Generation actor Brent Spiner will also be there
- Season 5 Episode 4: The Wiggly Finger Catalyst
Raj feels upset about not being in a relationship, so Penny sets out to find a date and introduces him to a girl he can actually talk to. They hit it off, but when it becomes apparent he has been buying his new girlfriend large amounts of expensive gifts his friends become suspicious she is only interested in his wealth
- Season 5 Episode 3: The Pulled Groin Extrapolation
Leonard inadvertently gives the impression he is attracted to Amy when he goes as her date to her colleague's wedding. Meanwhile, Howard tries to persuade Bernadette they should live with his mother after getting married and suggests a trial run of the arrangement over the weekend
- Season 5 Episode 2: The Infestation Hypothesis
Amy is caught in a battle of wills between Sheldon and Penny, while Leonard tries to reignite his long-distance relationship with Priya, who has moved back to India. Comedy, starring Johnny Galecki, Kaley Cuoco and Jim ParsonsThursday 30th May 7:30pm EDT - WTTG (FOX)
- Season 5 Episode 1: The Skank Reflex Analysis
Penny worries about the consequences of spending the night with Raj, and Leonard's reaction confirms her worst fears. Meanwhile, Sheldon is more interested in the upcoming paintball competition, and tries to refocus the boys' attentions as they argue over the previous evening's activities. Comedy, starring Jim Parsons, Johnny Galecki and Kaley CuocoWednesday 29th May 7:30pm EDT - WTTG (FOX)
The Big Bang Theory: Season 4 (2010 - 2011)
- Season 4 Episode 24: The Roommate Transmogrification
Bernadette receives her PhD, and the friends then tease Howard about being the only one among them who is not a doctor. Meanwhile, Raj becomes Sheldon's new flatmate after overhearing Leonard and Priya engaging in a Star Trek bedroom fantasy. Comedy, starring Johnny Galecki, Jim Parsons and Kunal NayyarTuesday 28th May 7:30pm EDT - WTTG (FOX)
- Season 4 Episode 23: The Engagement Reaction
Howard decides to tell his mother that he and Bernadette are engaged - but she later collapses, making him fear the shock of the news has caused her to have a heart attack. As the gang convenes at the hospital, Sheldon's fear of infectious diseases lands him in trouble, while Priya and Penny bond over coffeeMonday 27th May 7:30pm EDT - WTTG (FOX)
- Season 4 Episode 22: The Wildebeest Implementation
Amy and Penny ask Bernadette to help them spy on Leonard and Priya after the couple invite her and Howard to dinner. An experimental drug helps Raj overcome his fear of talking to women, but the cure proves more effective than he had hoped. Comedy, starring Johnny Galecki and Jim ParsonsFriday 24th May 7:30pm EDT - WTTG (FOX)
- Season 4 Episode 21: The Agreement Dissection
Sheldon is infuriated when Priya uses her legal knowledge to find a loophole in the room-mate agreement - but his spirits are lifted by a night on the town with Amy, Penny and Bernadette. Comedy, starring Jim Parsons, Johnny Galecki and Kaley CuocoThursday 23rd May 7:30pm EDT - WTTG (FOX)
- Season 4 Episode 20: The Herb Garden Germination
Amy and Sheldon start a gossip experiment to see how quickly rumours spread among the gang, while Howard tells his friends that he is planning to propose to Bernadette - not realising Raj is wrestling with his own feelings for her. Comedy, starring Johnny Galecki, Jim Parsons and Kaley CuocoWednesday 22nd May 7:30pm EDT - WTTG (FOX)
- Season 4 Episode 19: The Zarnecki Incursion
Sheldon is distraught when his online gaming account is hacked, so his friends decide to find out who is responsible - but then make the disastrous mistake of confronting the culprit in person. Comedy, starring Johnny Galecki, Jim Parsons and Kaley CuocoTuesday 21st May 7:30pm EDT - WTTG (FOX)
- Season 4 Episode 18: The Prestidigitation Approximation
Leonard faces the difficult decision of choosing between his relationship with Priya and his friendship with Penny. Meanwhile, Howard impresses his friends with a magic trick - and an exasperated Sheldon is determined to figure out how he did it. Comedy, starring Johnny Galecki and Jim ParsonsMonday 20th May 7:30pm EDT - WTTG (FOX)
- Season 4 Episode 17: The Toast Derivation
Sheldon decides to make a new set of friends as he is depressed that the group's social world revolves around Leonard rather than himself. Meanwhile, Amy and Bernadette try to persuade Penny to go on a date. Comedy, guest starring LeVar Burton (Star Trek: The Next Generation), with Johnny Galecki, Jim Parsons and Mayim Bialik
- Season 4 Episode 16: The Cohabitation Formulation
Wolowitz is torn between taking his relationship with Bernadette to the next level and pleasing his mother - and the solution he comes up with leaves everyone unsatisfied. Leonard rekindles his romance with Raj's sister Priya, while Amy uses Penny's emotions as the basis for a research project
- Season 4 Episode 15: The Benefactor Factor
Leonard is forced to consider how far he is willing to push himself in the name of science when a wealthy benefactor makes an indecent proposal. Comedy, starring Johnny Galecki, with Jessica Walter (Arrested Development) and Joshua Malina (The West Wing)
- Season 4 Episode 14: The Thespian Catalyst
Sheldon agrees to participate in a series of short lectures at the university, but is worried the students dislike him. On Amy's guidance, he asks Penny to give him acting lessons to help him engage with his audience. Elsewhere, Koothrappali fantasises about his best friend's partner. Comedy, starring Jim Parsons
- Season 4 Episode 13: The Love Car Displacement
Tensions run high when the gang attends a weekend science conference. Wolowitz becomes argumentative after Bernadette runs into a former boyfriend, and the fallout causes chaos with the hotel room arrangements. Comedy, guest starring Rick Fox, with Simon Helberg and Melissa Rauch
- Season 4 Episode 12: The Bus Pants Utilisation
Leonard's ingenious idea for a new smartphone application puts pressure on his friendship with Sheldon, who fights with him for control of the project. Comedy, starring Johnny Galecki and Simon Helberg
- Season 4 Episode 11: The Justice League Recombination
The guys have fun at the expense of Penny's boyfriend Zack, but later try to make amends by helping him with the New Year's costume competition at the comic-book store. Comedy, starring Kaley Cuoco and Simon Helberg
- Season 4 Episode 10: Howard's Best Episodes: The Big Bang Theory: The Alien Parasite Hypothesis
Amy finds she has romantic feelings for Penny's former boyfriend Zack, while Raj and Howard begin competing to prove which of them would make the better superhero. Comedy, guest starring Brian Thomas Smith
- Season 4 Episode 9: The Boyfriend Complexity
Penny's dad pays a visit and Leonard discovers she told her parents they were back together, so he plays his boyfriend role to the hilt - much to her dismay. Meanwhile, Raj gets drunk and makes a pass at Howard's girlfriend Bernadette. Guest starring Keith Carradine (Dexter)
- Season 4 Episode 8: The 21-Second Excitation
The friends set up camp outside a cinema to get tickets for a new cut of Raiders of the Lost Ark - but find themselves resuming hostilities with Sheldon's old foe Wil Wheaton, the former Star Trek: The Next Generation actor. Meanwhile, Penny and Bernadette invite Amy to a sleepover
- Season 4 Episode 7: The Apology Insufficiency
Leonard vows to be more self-assured around women, believing his problem attracting a girlfriend stems from a lack of confidence. An FBI agent interviews the gang to assess Howard's suitability for a team working on a new surveillance satellite. Guest starring Eliza Dushku (Dollhouse)
- Season 4 Episode 6: The Irish Pub Formulation
Raj's sister Priya visits the gang, causing tension when Leonard tries to cover up the fling he once had with her. After discovering his friend's secret, Sheldon struggles to keep quiet, leading the guys to reveal information they have all been keeping from one another
- Season 4 Episode 5: The Desperation Emanation
Leonard is depressed that everyone seems to be paired off except him, and takes desperate measures to get a girlfriend. Meanwhile, Sheldon looks for a way out of his relationship with Amy, who wants him to meet her mother. Comedy, starring Johnny Galecki and Melissa Rauch
- Season 4 Episode 4: The Hot Troll Deviation
An embarrassing secret from Wolowitz's past comes to light as he tries to win back ex-girlfriend Bernadette, while Sheldon and Raj engage in a battle of wills when they have to work in the same office space. Guest starring Katee Sackhoff (Battlestar Galactica) and George Takei (Star Trek)
- Season 4 Episode 3: The Zazzy Substitution
Sheldon breaks up with Amy, and turns to the feline world in his search for an alternative to human companionship. However, when he starts to bulk-buy pet cats, Leonard decides enough is enough, and calls for reinforcements to help bring his friend back to his senses. Comedy, starring Jim Parsons
- Season 4 Episode 2: Sheldon's Best Episodes: The Big Bang Theory: The Cruciferous Vegetable Amplification
Sheldon tries to extend his lifespan when he realises he will not be around long enough for his consciousness to be downloaded into a robot body, and the friends encounter Apple co-founder Steve Wozniak (guest starring as himself) at the Cheesecake Factory
- Season 4 Episode 1: Howard's Best Episodes: The Big Bang Theory: The Robotic Manipulation
Penny is stunned when Sheldon announces he is about to go on his first-ever date, and is even more surprised to find herself tagging along. Meanwhile, Leonard and Raj take a trip to the hospital after Wolowitz's new robotic arm creates problems
The Big Bang Theory: Season 3 (2009 - 2010)
- Season 3 Episode 23: The Lunar Excitation
Raj and Howard register Sheldon with an online dating site and find his perfect woman, who appears to be his female equivalent. Meanwhile, Penny gets drunk and seduces Leonard, but she regrets it the next day. Comedy, starring Johnny Galecki, Jim Parsons and Kaley Cuoco. Mayim Bialik (Blossom) joins the cast
- Season 3 Episode 22: The Staircase Implementation
The comedy flashes back to reveal how Sheldon saved the lives of his pals, and looks at the origins of his friendship with Leonard seven years previously, as well as explaining the housemates' agreement. Comedy, starring Johnny Galecki and Jim Parsons
- Season 3 Episode 21: The Plimpton Stimulation
Sheldon invites a famous physicist to the flat after befriending her online, but is put out to find Leonard showing an interest in her. Meanwhile, Penny has to confront her boyfriend when the visitor turns up in his bedroom. Guest starring Judy Greer (Glenn Martin, DDS)
- Season 3 Episode 20: The Spaghetti Catalyst
Sheldon tries to hide the fact he had dinner with Penny after she broke up with Leonard, hoping to stay friends with her. However, keeping secrets does not prove to be his area of expertise, and it is not long before for his double life is exposed. Comedy, starring Jim Parsons, Kaley Cuoco and Johnny Galecki
- Season 3 Episode 19: The Wheaton Recurrence
Leonard tells Penny he loves her, but fails to get the response he would have liked. Sheldon also finds himself competing against Star Trek: The Next Generation actor Wil Wheaton once again when the gang goes bowling - and tries to get his revenge
- Season 3 Episode 18: The Pants Alternative
Sheldon is awarded a prestigious prize by the university but worries about the speech he will have to make when collecting the award so Penny and Koothrappali try to build up his confidence - with little success
- Season 3 Episode 17: The Precious Fragmentation
The friends fight over a ring they believe was used in The Lord of the Rings. Leonard hopes to return the item to its rightful owner - but Raj wishes to sell it so he can buy a jet ski, and Sheldon takes on the persona of Gollum when he becomes obsessed with the piece of jewelleryWednesday 29th May 10:30pm EDT - Turner Broadcasting System
- Season 3 Episode 16: The Excelsior Acquisition
Sheldon misses an opportunity to meet Spiderman creator Stan Lee when he has to go to court for driving through a red light while taking Penny to hospital, and his anger at the inconvenient timing leads to him being imprisoned. Feeling guilty, Penny finds out the address of the man behind the superhero and takes Sheldon there - but his troubles with the law have yet to reach their conclusion and the visit does not go as expectedWednesday 29th May 10:00pm EDT - Turner Broadcasting System
- Season 3 Episode 15: The Large Hadron Collision
When Leonard is invited to see the world's largest particle accelerator in Switzerland, he asks Penny to join him as a Valentine's Day treat - much to the disappointment of Sheldon, who tries to persuade the couple to allow him to take her placeWednesday 29th May 9:30pm EDT - Turner Broadcasting System
- Season 3 Episode 14: Sheldon's Best Episodes: The Big Bang Theory: The Einstein Approximation
Sheldon develops a mental block and has difficulty working on a formula, so in a move inspired by Albert Einstein he gets a job at the Cheesecake Factory diner to try to revive his creativity - and despite Penny's objections, proves surprisingly effective in the role. Guest starring Yeardley Smith (The Simpsons)Wednesday 29th May 9:00pm EDT - Turner Broadcasting System
- Season 3 Episode 13: The Bozeman Reaction
Leonard and Sheldon's flat is burgled, so they work on a state-of-the-art security system in a bid to outwit any future would-be thieves. However, their plans go awry when they ensnare Penny in a net. Comedy, starring Johnny Galecki and Jim ParsonsWednesday 29th May 8:30pm EDT - Turner Broadcasting System
- Season 3 Episode 12: The Psychic Vortex
Raj lusts after a girl he meets while attending a university party with Sheldon, and Leonard lives to regret airing his disapproval of Penny's belief in psychics. Comedy, starring Kunal Nayyar and Jim ParsonsTuesday 28th May 10:30pm EDT - Turner Broadcasting System
- Season 3 Episode 11: The Maternal Congruence
When his mother turns up unannounced, Leonard's horror turns to anger when he learns Sheldon knew about the visit - and his parents' divorce - before him. After going out drinking with Penny, Leonard's mother and Sheldon kiss. Guest starring Christine Baranski (The Good Wife)Tuesday 28th May 9:30pm EDT - Turner Broadcasting System
- Season 3 Episode 10: The Gorilla Experiment
Wolowitz accuses Leonard of being interested in his girlfriend after Bernadette shows interest in his experiments, while Penny is also jealous and asks Sheldon to teach her physics so she can discuss Leonard's work with him. Johnny Galecki, Simon Helberg and Kaley Cuoco starTuesday 28th May 9:00pm EDT - Turner Broadcasting System
- Season 3 Episode 9: The Vengeance Formulation
Howard starts avoiding Bernadette after his fears grow about committing to her, but he soon realises he has made a mistake and tries to compensate for it. Meanwhile, Kripke plays a prank on Sheldon during a radio interview, and the victim finds himself caught out by the Dean when he tries to get revenge. Johnny Galecki, Simon Helberg and Kaley Cuoco star, with an appearance by Katee Sackhoff (Battlestar Galactica) as herselfSunday 26th May 9:30pm EDT - WDCA (MyNetworkTV)
- Season 3 Episode 8: The Adhesive Duck Deficiency
Leonard, Rajesh and Howard go camping to watch the Leonid meteor shower, but the trip takes an unexpected turn thanks to some specially baked cookies. Meanwhile, Penny injures herself when she slips in the shower, and with the rest of the gang out of town, it is left to Sheldon to come to her aidSunday 26th May 9:00pm EDT - WDCA (MyNetworkTV)
- Season 3 Episode 7: The Guitarist Amplification
A jealous Leonard argues with Penny when she invites one of her male friends to stay at her apartment while he is in town. Unfortunately, the row brings up unpleasant memories for Sheldon of watching his warring parents, causing even more tension between the friends. Johnny Galecki, Kaley Cuoco and Jim Parsons starThursday 23rd May 10:30pm EDT - Turner Broadcasting System
- Season 3 Episode 6: The Cornhusker Vortex
Leonard worries his lack of American football knowledge is alienating him from Penny and her friends. However, he finds an unlikely sporting tutor in the form of Sheldon, who reluctantly spent most of his childhood attending games with his father. Meanwhile, Raj is infuriated when Howard abandons him to pursue a girl at a kite-flying contestThursday 23rd May 9:30pm EDT - Turner Broadcasting System
- Season 3 Episode 5: The Creepy Candy Coating Corollary
Sheldon is given the chance to square off against the one actor from the Star Trek franchise he holds a grudge against - Wil Wheaton. Meanwhile, Leonard asks Penny to set Howard up on a date with one of her friends. Comedy, starring Johnny Galecki and Jim ParsonsTomorrow at 9:30pm EDT - WDCA (MyNetworkTV)
- Season 3 Episode 4: The Pirate Solution
Raj accepts Sheldon's offer to work for him as he is desperate to avoid being sent back to India. Howard starts spending more time with Leonard and Penny, who would rather be left alone. Johnny Galecki, Simon Helberg and Kaley Cuoco starTomorrow at 9:00pm EDT - WDCA (MyNetworkTV)
- Season 3 Episode 3: Howard's Best Episodes: The Big Bang Theory: The Gothowitz Deviation
Leonard tries to mould Penny into his dream woman and rewards her with chocolate when she does things he approves of - in the hope that she will keep doing them. Meanwhile, Howard and Raj meet two women at a goth nightclub, and things appear to be going well until the ladies take them to a tattoo shopTomorrow at 8:30pm EDT - WDCA (MyNetworkTV)
- Season 3 Episode 2: The Jiminy Conjecture
Sheldon and Howard stake their most highly prized comic books on a bet to determine the species of a cricket, while Leonard and Penny struggle to recover from an awkward first night together. Johnny Galecki, Simon Helberg and Kaley Cuoco starTomorrow at 8:00pm EDT - WDCA (MyNetworkTV)
- Season 3 Episode 1: The Electric Can Opener Fluctuation
Sheldon returns to Texas in disgrace when he discovers his friends tampered with the Arctic expedition data after growing tired of his quest for a scientific breakthrough. Leonard becomes frustrated when constant interruptions affect his attempts to woo Penny, but his mood improves when the pair finally sleep togetherWednesday 22nd May 9:00pm EDT - Turner Broadcasting System
The Big Bang Theory: Season 2 (2008 - 2009)
- Season 2 Episode 23: Monopolar Expedition
Sheldon wins a grant to pay for a summer expedition to the North Pole, and invites his friends to join him. However, the gang's imminent departure causes Leonard and Penny to reconsider their feelings for each other. Johnny Galecki and Kaley Cuoco starTuesday 21st May 10:30pm EDT - Turner Broadcasting System
- Season 2 Episode 22: The Classified Materials Turbulence
Stuart takes Penny out for a second date, during which she drunkenly reveals her true feelings. Meanwhile, Wolowitz uncovers a flaw in the toilet he designed for a Nasa space shuttle, and enlists the aid of friends to correct it before the craft is launched. Kaley Cuoco, Kevin Sussman and Simon Helberg starTuesday 21st May 9:30pm EDT - Turner Broadcasting System
- Season 2 Episode 21: The Vegas Renormalisation
Sheldon is forced to spend the night at Penny's after accidentally locking himself out of his own apartment. Meanwhile, Leonard and Raj take a heartbroken Wolowitz to Las Vegas to cheer him up, where they pay a prostitute to take an interest in their downhearted friend. With guest star Jodi Lynn O'Keefe (Prison Break)Tuesday 21st May 9:00pm EDT - Turner Broadcasting System
- Season 2 Episode 20: The Hofstadter Isotope
Penny catches the eye of a comic-book shopkeeper, and Leonard is devastated when she gives serious consideration to dating her new admirer. Desperate for help, Leonard enlists Sheldon to discredit his love rival by preying on his obsessive enthusiasm with Batman. Johnny Galecki, Kaley Cuoco and Kevin Sussman starTuesday 21st May 8:30pm EDT - Turner Broadcasting System
- Season 2 Episode 19: The Dead Hooker Juxtaposition
Penny feels threatened when another sexy woman, who has landed a role in TV series CSI, moves into the apartment building, and gradually begins to sense that her friends are being manipulated by the new arrival. Comedy, starring Kaley Cuoco, Valerie Azlynn, Johnny Galecki and Simon HelbergTuesday 21st May 8:00pm EDT - Turner Broadcasting System
- Season 2 Episode 18: The Work Song Nanocluster
Penny starts her own hair accessories business, but makes the mistake of asking Sheldon to help - with disastrous results. Comedy, starring Jim Parsons and Kaley Cuoco
- Season 2 Episode 17: The Terminator Decoupling
While travelling to San Francisco, Leonard, Sheldon, Wolowitz and Raj discover actor Summer Glau is sharing a train with them. Desperate to discuss the Terminator TV series with her, the friends devise a series of plans to engage her in conversation. With Johnny Galecki, Simon Helberg, Jim Parsons and Rajesh Nayyar
- Season 2 Episode 16: The Cushion Saturation
Tensions between Sheldon and Penny reach an all-time high after a paintballing accident leaves an ugly stain on the awkward physicist's favourite couch cushion. Meanwhile, romance blossoms between Leslie and Wolowitz. Jim Parsons and Kaley Cuoco star
- Season 2 Episode 15: The Maternal Capacitance
Leonard and Penny share an intimate moment as they recover from receiving a psychological deconstruction from the physicist's emotially distant mother, an expert in psychiatry and neural sciences. Guest starring Mamma Mia! actor Christine Baranski
- Season 2 Episode 14: The Financial Permeability
Penny runs into money troubles, so Sheldon offers to lend her some cash to help her pay the rent. However, when Leonard discovers that his neighbour's former boyfriend Kurt is the cause of her financial woes, he gathers the gang for a confrontation. Starring Jim Parsons, Johnny Galecki and Kaley CuocoWednesday 29th May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 13: The Friendship Algorithm
Sheldon decides to put his formidable brain power to use in formulating a scientific procedure for making friends. However, to prove his findings, he must first win the trust of fellow scientist Barry Kripe to gain access to his powerful computer. Comedy, starring Jim Parsons and John Ross BowieTuesday 28th May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 12: The Killer Robot Instability
Sheldon and the gang are excited when Barry Kripke challenges them to a robot duel and they cannot wait to start building their 'killer' machine called Monte. Meanwhile, Penny confronts Wolowitz about his crude behaviour toward women. Guest starring John Ross BowieMonday 27th May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 11: Sheldon's Best Episodes: The Big Bang Theory: The Bath Item Gift Hypothesis
Sheldon's obsession with gift-giving etiquette annoys his friends as Christmas approaches. Meanwhile, Leonard is thrilled to meet an award-winning scientist, only to be filled with jealousy when his new colleague takes an interest in Penny. With guest star Michael Trucco (Battlestar Gallactica and One Tree Hill)Friday 24th May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 10: The Vartabedian Conundrum
Leonard turns to Penny for advice when his relationship with Stephanie takes off faster than he would have liked, and he realises he is the last person to notice that she has moved in with him. Comedy, starring Johnny Galecki and Kaley CuocoThursday 23rd May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 9: The White Asparagus Triangulation
Sheldon is delighted that Leonard has finally managed to find a girlfriend who meets his high standards, but his over-exuberance looks set to cause problems. Jim Parsons and Johnny Galecki starWednesday 22nd May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 8: The Lizard-Spock Expansion
A smitten Wolowitz becomes convinced he has met his soul-mate in the form of Stephanie Barnett, a distinguished resident surgeon. However, he fails to realise that the object of his affections is far more interested in Leonard. Less Than Perfect's Sara Rue guest starsTuesday 21st May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 7: The Panty Pinata Polarisation
Penny begins visiting the boys' flat to watch her favourite shows after her TV breaks down. However, when Sheldon tires of her presence he bans her from his home, only for her to seek an embarrassing form of vengeance. Meanwhile, Howard and Raj search for the America's Next Top Model houseMonday 20th May 10:00pm EDT - WDCA (MyNetworkTV)
- Season 2 Episode 6: The Cooper-Nowitzki Theorem
An obsessive student takes a shine to Sheldon, and before he knows what has happened, the misanthropic physicist finds himself with a girlfriend. However, his new partner quickly expresses distaste toward his social life, and removes him from his limited circle of friends by forcing him to work on a troublesome scientific problem. With guest star Riki Lindhome
- Season 2 Episode 5: The Euclid Alternative
Sheldon is forced to confront his fear of driving when both Penny and Howard refuse to give him a lift to work. Desperate to be free of the obligation, Leonard and the gang intervene to discover why the physicist never learned to drive. Comedy, starring Jim Parsons and Johnny Galecki, with Octavia Spencer (The Help)
- Season 2 Episode 4: The Griffin Equivalency
Leonard encourages Howard and Sheldon to be supportive when Raj is named one of People magazine's '30 to Watch Under 30'. However, when Raj makes a pass at Penny, Leonard struggles to maintain a positive perspective on his friend's new-found confidence. Kunal Nayyar and Kaley Cuoco star, with a guest appearance by Charlie Sheen
- Season 2 Episode 3: The Barbarian Sublimation
Penny becomes addicted to an online game based on the world of Conan the Barbarian. As her obsession intensifies, she begins to neglect her friends, and seeks, instead, the company of the usually snide Sheldon whom she continually pesters for advice. Starring Kaley Cuoco and Jim Parsons
- Season 2 Episode 2: The Codpiece Topology
Leonard is dejected to see Penny with another man and decides to cut his losses by going back to fellow scientist Leslie Winkle - a move that upsets Sheldon. Starring Johnny Galecki, Kaley Cuoco and Sara Gilbert
- Season 2 Episode 1: The Bad Fish Paradigm
Sheldon finds himself forced to keep a secret when Penny decides to confide in him about what happened on her disappointing first date with Leonard. Comedy, starring Johnny Galecki, Kaley Cuoco and Jim Parsons
The Big Bang Theory: Season 1 (2007 - 2008)
- Season 1 Episode 17: The Tangerine Factor
Following the break-up of Penny's relationship, Leonard finally summons up the courage to ask her out. When she accepts, each of them separately asks Sheldon for advice on how to handle the forthcoming date. Last in series, starring Johnny Galecki, Kaley Cuoco and Jim Parsons
- Season 1 Episode 16: Howard's Best Episodes: The Big Bang Theory: The Peanut Reaction
When Penny finds out Leonard's family never celebrated his birthdays she enlists Sheldon's help to organise him a surprise party, while Wolowitz gets him out of the way by staging an emergency hospital visit. Kaley Cuoco and Johnny Galecki star
- Season 1 Episode 15: The Pork Chop Indeterminacy
All Sheldon's friends fall for his sexy twin sister, who has arrived to pay him a visit, but he declares he will have the final say on who can date her - an announcement that particularly dismays Leonard. Comedy, starring Johnny Galecki and Jim Parsons
- Season 1 Episode 14: The Nerdvana Annihilation
Penny makes fun of Leonard's habit of collecting sci-fi memorabilia, so he decides to give it up - but his friends object and do everything possible to persuade him not to change his ways. Comedy, starring Johnny Galecki and Kaley Cuoco
- Season 1 Episode 13: The Bat Jar Conjecture
The gang kicks Sheldon out of the physics bowling team and replace him with Leslie, so he decides to try and prove his superiority by forming a rival squad of his own. Johnny Galecki, Jim Parsons and Kaley Cuoco starSaturday 25th May 10:30pm EDT - Turner Broadcasting System
- Season 1 Episode 12: The Jerusalem Duality
Sheldon feels threatened when he meets a 15-year-old physics prodigy who is even smarter than he is, so Leonard agrees to help him discredit the precocious youngster's research. Johnny Galecki, Simon Helberg and Kaley Cuoco starSaturday 25th May 10:00pm EDT - Turner Broadcasting System
- Season 1 Episode 11: The Pancake Batter Anomaly
Sheldon falls ill, and his friends decide to go to a Planet of the Apes movie marathon to keep their distance, knowing he will be in a terrible mood. However, an unsuspecting Penny offers to nurse him. Comedy, starring Johnny Galecki, Simon Helberg and Kaley CuocoSaturday 25th May 9:30pm EDT - Turner Broadcasting System
- Season 1 Episode 10: The Loobenfeld Decay
Sheldon and Leonard invent excuses to avoid having to attend Penny's performance in a production of the stage musical Rent, but maintaining the pretence becomes increasingly complicated. Johnny Galecki, Simon Helberg and Kaley Cuoco star, with DJ Qualls (Road Trip)Saturday 25th May 9:00pm EDT - Turner Broadcasting System
- Season 1 Episode 9: The Cooper-Hofstadter Polarisation
Leonard and Sheldon receive an invitation to present their research to a physics conference, but Sheldon's reluctance to pander to his peers causes conflict between the friends - with Penny's intervention only making matters worse. Johnny Galecki and Jim Parsons starSaturday 25th May 8:30pm EDT - Turner Broadcasting System
- Season 1 Episode 8: The Grasshopper Experiment
Raj's parents set him up on a blind date in the hope of initiating an arranged marriage, but after a promising start it becomes apparent that the girl in question is more interested in Sheldon. Meanwhile, Penny begins her new job as a bartender. Starring Kunal Nayyar and Jim ParsonsSaturday 25th May 8:00pm EDT - Turner Broadcasting System
- Season 1 Episode 7: The Dumpling Paradox
Howard hooks up with one of Penny's promiscuous friends, prompting the guys to fly into a panic and enlist their neighbour to make up the numbers to play a video game. Starring Simon Helberg, Kaley Cuoco and Johnny GaleckiSaturday 25th May 7:30pm EDT - Turner Broadcasting System
- Season 1 Episode 6: The Middle Earth Paradigm
Penny hosts a Halloween costume party, which proves to be a worthy test for Leonard, Sheldon, Howard and Raj's social skills. During the event, Leonard has a run-in with Penny's ex-boyfriend. Kaley Cuoco, Johnny Galecki and Simon Helberg starSaturday 25th May 7:00pm EDT - Turner Broadcasting System
- Season 1 Episode 5: The Hamburger Postulate
Leonard fears he is wasting his time with Penny and ends up spending the night with fellow scientist Leslie. However he is disappointed when she later tells him she was only interested in a one-night stand. Meanwhile, Sheldon frets over a variation to his hamburger routine. Starring Johnny Galecki, Kaley Cuoco and Jim Parsons
- Season 1 Episode 4: The Luminous Fish Effect
Sheldon is fired for being disrespectful to his boss, and explores new activities in a bid to find a purpose in life other than physics, but Leonard takes drastic action to restore him to his old self. Laurie Metcalf (Desperate Housewives) guest stars as Sheldon's mother
- Season 1 Episode 3: The Fuzzy Boots Corollary
Leonard is upset to learn Penny is dating someone, so his friends and fellow scientists persuade him he should find a romance of his own by asking another woman out. Johnny Galecki and Kaley Cuoco star
- Season 1 Episode 2: The Big Bran Hypothesis
Leonard enlists his room-mate's help when he agrees to drop off a parcel for new neighbour Penny, but when Sheldon sees how messy her room is, he attempts to do a good deed which is not well received. Johnny Galecki, Jim Parsons and Kaley Cuoco star
- Season 1 Episode 1: Pilot
Comedy about two friends who understand more about the laws of physics than they do about interacting with other people. When a free-spirited beauty called Penny moves in next door, Leonard is immediately smitten with her, but Sheldon warns him he runs the risk of a broken heart if he tries to romance her. Johnny Galecki, Simon Helberg and Kaley Cuoco star
The Big Bang Theory: Special
- It All Started with a Bang
Rick Edwards celebrates the 100th episode of the American comedy by taking a look back at some of the show's most memorable scenes. He meets members of the cast and crew on-set in Hollywood, where they share their own favourite moments, and reveal a selection of behind-the-scenes secrets
- Access All Areas
An evening of special programming to celebrate the 100th episode of the sitcom, beginning with Rick Edwards travelling to Hollywood for a behind-the-scenes visit to the comedy's set, catching up with the cast and learning everything there is to know about the show
The Big Bang Theory: Other Episodes
- The Proton Resurgence
Leonard y Sheldon contratan al conductor de su programa de televisión favorito de la infancia para que actúe; Bernadette y Howard se meten en problemas mientras cuidan al perro de Raj.
- The Closure Alternative
Amy intenta ayudar a Sheldon a superar su necesidad compulsiva cuando uno de sus programas favoritos de televisión es cancelado; Raj descubre un secreto acerca de Lucy.
- The Tenure Turbulence
Las chicas se involucran cuando Leonard, Sheldon y Raj compiten por la permanencia en universidad.
- The Closet Reconfiguration
Howard considera si debe o no abrir una carta de su padre; Penny y Leonard son anfitriones en un cóctel para adultos.
- The Contractual Obligation Implementation
Leonard, Sheldon y Wolowitz hablan con chicas de secundaria acerca de carreras relacionadas con la ciencia; Raj planea una cita con Lucy.
- The Monster Isolation
Los habilidades de actuación de Penny impresiona a Sheldon.
- The Spoiler Alert Segmentation
Sheldon y Leonard se pelean; Raj ayuda Sra. Wolowitz.
- The Cooper/Kripke Inversion
Sheldon se enfrenta a una crisis de confianza cuando se ve obligado a trabajar con su némesis, Barry Kripke.
- The Bakersfield Expedition
As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.
- The Bakersfield Expedition
Mientras los chicos usan disfraces y viajan por carretera a una convención de cómics, las damas deciden quedarse en casa e intentan interpretar un libro de historietas.
- The Egg Salad Equivalency
Cuando Sheldon es acusado de acoso sexual, él termina provocándoles muchos problemas a Raj, Leonard y Wolowitz.
- The Santa Simulation
Sheldon recuerda la Navidad durante un juego; Amy, Penny y Bernadette le buscan una cita a Koothrappali.
- The Fish Guts Displacement
Amy se enferma y Sheldon intenta cuidarla mientras se recupera; Wolowitz y su suegro planean un viaje de pesca.
- The Parking Spot Escalation
La pelea de Sheldon y Wolowitz por un lugar de estacionamiento en la universidad impacta al grupo.
- The 43 Peculiarity
Raj y Howard intentan descubrir por qué Sheldon desaparece cada tarde a las 2:45; los celos aumentan en la relación de Penny y Leonard.
- The Habitation Configuration
Bernadette quiere que Wolowitz se salga de la casa de su mamá; Sheldon está atrapado en medio de la discusión entre Amy y Wil Wheaton.
- The Extract Obliteration
Un juego amenaza la relación de Sheldon con Stephen Hawking; Penny se inscribe en secreto para una clase universitaria.
- The Holographic Excitation
El grupo se dirige a la tienda de libros de historietas de Stuart para celebrar Halloween; Leonard usa la ciencia para seducir a Penny.
- The Re-Entry Minimization
El regreso de Wolowitz del espacio no es todo lo que él esperaba; juego se convierte en una guerra.
- The Decoupling Fluctuation
Sheldon intenta intervenir cuando él descubre que Penny está pensando terminar su relación con Leonard; Howard is picked on
- The Higgs Boson Observation
Amy se siente amenazada por la nueva asistente de Sheldon; Wolowitz empieza a sentir las presiones de estar en el espacio.
- The Date Night Variable
Raj enfrenta su soledad mientras sus amigos tienen citas; Wolowitz es arrastrado a una pelea entre Bernadette y su mamá, mientras está en el espacio.
- The Launch Acceleration
Planes de boda son puestos en peligro cuando NASA cambia la fecha de su viaje espacial; Penny es sorprendida por la propuesta de Leonard.
- The Stag Convergence
La historia sexual de Howard hace reconsiderar a Bernadette sobre su futuro juntos.
- The Countdown Reflection
Ganga organiza la boda de Wolowitz y Bernadette, antes que él parta para su viaje al espacio.
- The Hawking Excitation
Cuando Wolowitz trabaja con Stephen Hawking, Sheldon esta decidido a concer al científico famoso.
- The Transporter Malfunction
Tras recibir una pieza de colección de Viaje a las Estrellas, Sheldon se encuentra acosado por el Sr. Spock.
- The Weekend Vortex
Sheldon planea un maratón de videojuegos con los chicos en vez de asistir a la fiesta de la tía de Amy.
- The Werewolf Transformation
La rutina de Sheldon es interrumpida cuando su peluquero se enferma; Wolowitz duda sobre su decisión de ir al espacio.
- The Rothman Disintegration
Sheldon y Kripke compiten por una oficina; Penny recibe un regalo de Amy.
- The Vacation Solution
Sheldon trabaja con Amy en su laboratorio cuando la universidad lo obliga a tomar una vacación.
- The Friendship Contraction
Leonard empieza a reconsiderar su amistad con Sheldon; Wolowitz intenta elegir un apodo de astronauta.
- The Beta Test Initiation
Penny y Leonard experimentan con su nueva relación; Raj forma una relación con su asistente telefónico virtual.
- The Recombination Hypothesis
Todo puede cambiar cuando Leonard invita espontáneamente a Penny a una cena romántica.
- The Speckerman Recurrence
Leonard debe enfrentarse a un acosador que lo atacó en la preparatoria.
- The Flaming Spittoon Acquisition
Sheldon está celoso cuando Stuart (Kevin Sussman), un chico de la tienda de libros de historietas, le pide una cita a Amy.
- The Ornithophobia Diffusion
Leonard y Penny pasan un tiempo solos; Sheldon intenta enfrentar su miedo a los pájaros.
- The Isolation Permutation
Amy está devastada cuando Penny y Bernadette compran vestidos de novia sin ella.
- The Rhinitis Revelation
Sheldon compite con todos sus amigos por la atención de su madre (Laurie Metcalf) cuando ella está de visita.
- The Good Guy Fluctuation
Una atractiva arista de los libros de historietas prueba la relación de Leonard y Priya; Sheldon intenta asustar a sus amigos.
- The Russian Rocket Reaction
Wil Wheaton invita a Leonard y Sheldon a una fiesta en su casa; Howard recibe una oportunidad.
- The Wiggly Finger Catalyst
Penny presenta a Raj con mujer con quien puede comunicarse.
- The Pulled Groin Extrapolation
Amy y Leonard intentan conocerse mejor; Bernadette, Howard y la Sra. Wolowitz pasan el fin de semana juntos.
- The Skank Reflex Analysis
Penny está preocupada porque ha arruinado su relación con sus amigos; Sheldon toma mando del equipo de paintball.
- The Infestation Hypothesis
Amy está atrapada en medio de una pelea cuando Penny y Sheldon discuten por una silla; Leonard intenta que su relación a larga distancia sea más emocionante.
- The Roommate Transmogrification
Bernadette recibe su doctorado, inspirando a los chicos a que molesten a Wolowitz por su falta de un título.
- The Engagement Reaction
Mamá de Howard termina en el hospital después de escuchar noticias de su compromiso con Bernadette.
- The Wildebeest Implementation
Raj intenta curar su ansiedad social; Penny espía a Leonard y a su novia a través de Bernadette.
- The Agreement Dissection
Priya analiza el acuerdo con su compañera de cuarto; las damas sacan a bailar a Sheldon.
- The Herb Garden Germination
Amy y Sheldon difunden chisme como parte de un experimento; Howard decide dar un gran paso en su relación con Bernadette.
- The Zarnecki Incursion
Los chicos intentan averiguar quién robó la cuenta del juego en línea de Sheldon.
- The Prestidigitation Approximation
Leonard tiene que elegir entre Penny y su nueva novia, Priya; el truco de magia de Howard enloquece a Sheldon.
- The Toast Derivation
Sheldon se molesta cuando se entera que Leonard es el centro de su grupo de amigos.
- The Cohabitation Formulation
Wolowitz considera llevar las cosas con Bernadette al siguiente nivel; Leonard y la hermana de Raj reinician su relación.
- The Benefactor Factor
Un donador rico hace que Leonard se cuestione lo que él quiere hacer por la ciencia.
- The Thespian Catalyst
Sheldon toma clases de actuación con Penny con la esperanza de ser un mejor maestro; Koothrappali fantasea acerca de la novia de su amigo.
- The Love Car Displacement
Bernadette se encuentra con su ex-novio (Rick Fox) mientras asiste a evento de ciencia con Wolowitz.
- The Bus Pants Utilization
La idea de Leonard para una aplicación telefónica provoca una fricción en su amistad con Sheldon.
- The Justice League Recombination
Los chicos participan en un concurso de disfraces con el nuevo novio de Penny.
- The Alien Parasite Hypothesis
Amy descubre que ella siente algo por el ex de Penny; Koothrappali y Wolowitz intentan probar quién sería un mejor super héroe.
- The Boyfriend Complexity
Penny le pide a Leonard mentirle a su padre (Keith Carradine); Howard, Raj y Bernadette pasan toda una noche en un telescopio.
- The 21-Second Excitation
Los chicos acampan para ver una película; Penny y Bernadette invitan a Amy a una fiesta de pijamas.
- The Apology Insufficiency
La entrevista de Sheldon con el FBI pone en peligro la seguridad de Wolowitz.
- The Irish Pub Formulation
Leonard mantiene en secreto una aventura a Sheldon, Howard y Raj.
- The Desperation Emanation
Leonard se da cuenta de que es el único en su grupo que no tiene novia; Sheldon quiere deshacerse de su novia.
- The Hot Troll Deviation
Un secreto vergonzoso de Wolowitz es revelado; Raj y Sheldon se involucran en guerra en el trabajo.
- The Zazzy Substitution
Sheldon busca una alternativa para la compañía humana y los chicos se preocupan.
- The Cruciferous Vegetable Amplification
Sheldon intenta alargar su vida cuando se entera que no podrá transferir su conciencia al cuerpo de un robot.
- The Robotic Manipulation
Penny analiza a la primera cita de Sheldon; Wolowitz descubre nuevo uso para brazo robótico.
- The Lunar Excitation
Raj y Howard preparan un perfil en línea para citas por Sheldon.
- The Staircase Implementation
Leonard le cuenta a Penny acerca de cómo conoció a Sheldon y que le pasó al elevador.
- The Plimpton Stimulation
Leonard y Sheldon compiten por la atención de una física.
- The Spaghetti Catalyst
Sheldon se esfuerza por mantener felices a Leonard y Penny cuando ellos dejan de hablarse.
- The Wheaton Recurrence
Una pelea amenaza la relación de Penny y Leonard; Sheldon y Will Wheaton se enfrentan.
- The Pants Alternative
El pánico escénico de Sheldon se entromete entre él y un codiciado premio.
- The Precious Fragmentation
Cuando los chicos compran un anillo de 'El Señor de los Anillos' en una venta de garaje, el articulo amenaza con separarlos.
- The Excelsior Acquisition
Sheldon termina en la corte después de recibir una infracción por culpa de Penny.
- The Large Hadron Collision
Leonard debe decidir quién lo acompañará cuando él vaya a ver el Gran Colisionador de Hadrones el Día de San Valentín.
- The Einstein Approximation
Sheldon intenta encontrar la respuesta a un problema físico trabajando con Penny.
- The Bozeman Reaction
Después de que su departamento es robado, Leonard y Sheldon buscan a sus amigos para crear un sistema de seguridad de vanguardia.
- The Psychic Vortex
Sheldon y Koothrappali asisten a una reunión universitaria; Leonard descubre que Penny cree en los psíquicos.
- The Maternal Congruence
Leonard está horrorizado cuando su madre (Christine Baranski) lo visita.
- The Gorilla Experiment
Sheldon trata de ayudar a Penny a entender el trabajo de Leonard; Wolowitz está celoso cuando Leonard comienza a salir con su nueva novia.
- The Guitarist Amplification
Sheldon intenta hacer las paces cuando Leonard y Penny tienen una discusión.
- The Vengeance Formulation
Sheldon desea destruir a Kripke después de ser humillado en la radio; Wolowitz intenta no destruir su nueva relación con Bernadette.
- The Creepy Candy Coating Corollary
Sheldon intenta vengarse de su enemigo Wil Wheaton; Wolowitz desea que Penny le ayude con una amiga.
- The Adhesive Duck Deficiency
Penny se ve obligada a confiar en Sheldon cuando ella se lesiona, mientras Howard, Leonard y Raj están ausentes.
- The Cornhusker Vortex
Sheldon le enseña a Leonard cómo entender el fútbol americano; un incidente en una competencia de papalotes amenaza la amistad de Howard y Raj.
- The Pirate Solution
Raj se enfrenta a la deportación si no encuentra un trabajo; Leonard y Penny tratan con Howard como una tercera opción.
- The Gothowitz Deviation
Howard y Raj van a un centro nocturno Goth para conocer mujeres; Sheldon intenta modificar la conducta de Penny utilizando chocolates.
- The Jiminy Conjecture
Penny y Leonard intentan recuperarse de una relación complicada; Howard y Sheldon hacen una apuesta.
- The Electric Can Opener Fluctuation
Después de manipular la información de la expedición de Sheldon al Ártico, los chicos lo siguen de regreso a Texas, lo que amenaza las oportunidades de Leonard de tener un romance con Penny.
- The Classified Materials Turbulence
Penny hace una revelación sorprendente sobre Leonard durante su cita con Stuart; Wolowitz encuentra un desperfecto crítico de diseño en su proyecto de la NASA.
- The Vegas Renormalization
Koothrappali y Leonard llevan a Wolowitz a Las Vegas; Sheldon es encerrado con llave en su apartamento.
- The Hofstadter Isotope
Wolowitz y Leonard deciden investigar un bar local en la Noche de Damas.
- The Dead Hooker Juxtaposition
Penny desarrolla una rivalidad con una nueva vecina atractiva que amenaza su posición como abeja reina del edificio.
- The Cushion Saturation
Un juego de paintball provoca una pelea entre Sheldon y Penny, y un romance entre Leslie y Wolowitz.
- The Financial Permeability
La solución de Sheldon para las dificultades financiales de Penny causa una confrontación entre Leonard y el ex-novio de Penny.
- The Killer Robot Instability
Cuando un dicho de Penny sobre la vida amorosa de Wolowitz se hace deprimirse, los amigos de él pierden su compañero más importante para su competición de robot.
- The Bath Item Gift Hypothesis
Penny empieza salir con una colega guapo de Leonard; Leonard y sus amigos están molestados por la obsesión de Shelden de la etiqueta de dar regalos.
- The Vartabedian Conundrum
Leonard pide consejo de Penny cuando su relación nueva va demasiado rápido.
- The White Asparagus Triangulation
Sheldon está contenta cuando Leonard sale con una mujer quien tiene las calidades que Sheldon piensa ser necesarias.
- The Lizard-Spock Expansion
Leonard sin saber sale con la mujer nueva quien Wolowitz piensa es el amor de su vida.
- Monopolar Expedition
Mientras Leonard se prepara para una expedición de ciencia de tres meses, él y Penny reevalúan sus sentimientos de uno hacia el otro.
- The Panty Piñata Polarization
Cuando Sheldon corre a Penny del apartamento por una serie de infracciones, Penny intenta vengarse de él.
- The Cooper-Nowitzki Theorem
Sheldon y el grupo se confunden cuando una joven estudiante graduada se siente atraída por él.
- The Euclid Alternative
Leonard y sus amigos presentan una intervención para obligar a Sheldon a enfrentar sus temores para manejar.
- The Griffin Equivalency
Raj incrementa su ego e intenta vengarse de Penny luego de ser nombrado en el artículo de una revista.
- The Barbarian Sublimation
Sheldon crea a un monstruo cuando le muestra a Penny un juego en línea.
- The Codpiece Topology
Después de ver a Penny con un joven muy apuesto, Leonard reinicia su relación con Leslie Winkle, la peor enemiga de Sheldon.
- The Bad Fish Paradigm
La primera cita de Penny con Leonard tiene problemas; Penny descubre que Sheldon no es un buen confidente.
- The Work Song Nanocluster
El negocio de casa de Penny se vuelve en una completa pesadilla cuando Sheldon se hace cargo.
- The Terminator Decoupling
Leonard, Sheldon y Wolowitz están extasiado a aprender que una actriz de ciencia ficción famosa (Summer Glau) está en el tren a San Francisco con ellos.
- The Maternal Capacitance
Leonard y Penny se acercan después de una visita desastroso de la madre de Leonard (Christine Baranski).
- The Friendship Algorithm
Sheldon crea un procedimiento científico para hacer amigos.
- The Pork Chop Indeterminacy
Leonard idea un plan para eliminar a sus rivales cuando él, Wolowitz y Koothrappali se enamoran de la hermana gemela de Sheldon, pero su plan falla cuando Sheldon decide elegir con quién saldrá su hermana.
- The Tangerine Factor
Cuando Leonard finalmente se arma de valor para pedirle una cita a Penny, los dos acuden con Sheldon por un consejo.
- The Peanut Reaction
Penny descubre que Leonard no celebra los cumpleaños, por lo que ella planea una fiesta sorpresa; Sheldon inesperadamente vive una de sus más grandes fantasías en una tienda de electrónicos.
- The Nerdvana Annihilation
Leonard y los chicos compran una máquina del tiempo de una película clásica; Penny les cuenta a los chicos que su obsesión por los cómics y los juguetes es patética.
- The Bat Jar Conjecture
Cuando Sheldon trata de demostrar su superioridad mental cuando se entrenan para el Tazón de Física, los chicos lo botan del equipo.
- The Jerusalem Duality
Sheldon y Leonard buscan una manera de hacer fracasar la investigación de un prodigio de la física de 15 años de edad.
- The Pancake Batter Anomaly
Leonard y los chicos evitan a Sheldon cuando está enfermo, dejando a Penny a su cuidado hasta que recupera la salud.
- The Loobenfeld Decay
Leonard y Sheldon trata de evitar ver la interpretación de Penny después de escuchar su canción, pero la elaborada mentira de Sheldon los lleva a un inesperado resultado.
- The Cooper-Hofstadter Polarization
Penny intenta mediar cuando Sheldon y Leonard no están de acuerdo en presentar sus conclusiones en una conferencia de psíquicos.
- The Grasshopper Experiment
Koothrappali descubre durante una cita a ciegas que puede hablar con una mujer después de algunos tragos, pero la dama se interesa en Sheldon.
- The Dumpling Paradox
Penny duerme en el sillón de Leonard y Sheldon cuando Wolowitz se apodera del departamento; los chicos le piden a Penny que se una a su equipo 'Halo'.
- The Middle Earth Paradigm
Leonard, Sheldon, Wolowitz y Koothrappali asisten a la fiesta de Halloween de Penny.
- The Hamburger Postulate
Leonard descubre que su persecución de Penny es infructuosa y tiene un encuentro inesperado con una compañera científica (Sara Gilbert).
- The Luminous Fish Effect
Sheldon es despedido y así tiene la oportunidad de explorar la vida más allá de lo físico, pero cuando él empieza a tejer ropa y a actuar como una persona introvertida, Leonard le pide ayuda a la mamá de Sheldon.
- The Fuzzy Boots Corollary
Leonard está molesto al descubrir que Penny sale con otra persona y se arma de valor para conseguir una cita con otra mujer.
- The Big Bran Hypothesis
Leonard se ofrece como voluntario para firmar por un paquete, con la esperanza de provocar una buena impresión en Penny.
Leonard está feliz por conocer a su nueva vecina Penny, pero su compañero de cuarto piensa que él está persiguiendo un sueño imposible.