The Big Bang Theory Episode Guide

Episode Guide

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 Cuoco

    Thursday 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 Cuoco

    Monday 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 Parsons

    Thursday 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 Cuoco

    Wednesday 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 Nayyar

    Tuesday 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 coffee

    Monday 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 Parsons

    Friday 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 Cuoco

    Thursday 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 Cuoco

    Wednesday 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 Cuoco

    Tuesday 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 Parsons

    Monday 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)

The Big Bang Theory: Season 2 (2008 - 2009)

The Big Bang Theory: Season 1 (2007 - 2008)

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.

  • Pilot

    Leonard está feliz por conocer a su nueva vecina Penny, pero su compañero de cuarto piensa que él está persiguiendo un sueño imposible.

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