How Many Episodes Of “The Big Bang Theory” Have You

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(2007-2019) A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.

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    Season 1

  1. How Many Episodes Of "The Big Bang Theory" Have You 4

    1.

    Unaired Pilot(2006)

    The first Pilot of what will become “The Big Bang Theory”. Leonard and Sheldon are two awkward scientists who share an apartment. They meet a drunk girl called Katie and invite her to stay at their place, because she has nowhere to stay. The two guys have a female friend, also a scientist, called Gilda.

  2. How Many Episodes Of "The Big Bang Theory" Have You 5

    2.

    Pilot(2007)

    A pair of socially awkward theoretical physicists meet their new neighbor Penny, who is their polar opposite.

  3. How Many Episodes Of "The Big Bang Theory" Have You 6

    3.

    The Big Bran Hypothesis(2007)

    Penny is furious with Leonard and Sheldon when they sneak into her apartment and clean it while she is sleeping.

  4. How Many Episodes Of "The Big Bang Theory" Have You 7

    4.

    The Fuzzy Boots Corollary(2007)

    Leonard gets upset when he discovers that Penny is seeing a new guy, so he tries to trick her into going on a date with him.

  5. How Many Episodes Of "The Big Bang Theory" Have You 8

    5.

    The Luminous Fish Effect(2007)

    Sheldon’s mother is called to intervene when he delves into numerous obsessions after being fired for being disrespectful to his new boss.

  6. How Many Episodes Of "The Big Bang Theory" Have You 9

    6.

    The Hamburger Postulate(2007)

    Leslie seduces Leonard, but afterwards tells him that she is only interested in a one-night stand.

  7. How Many Episodes Of "The Big Bang Theory" Have You 10

    7.

    The Middle Earth Paradigm(2007)

    The guys are invited to Penny’s Halloween party, where Leonard has yet another run-in with Penny’s ex-boyfriend Kurt.

  8. How Many Episodes Of "The Big Bang Theory" Have You 11

    8.

    The Dumpling Paradox(2007)

    When Howard hooks up with Penny’s old friend, his absence in the gang causes problems for the rest of the guys.

  9. How Many Episodes Of "The Big Bang Theory" Have You 12

    9.

    The Grasshopper Experiment(2007)

    When Raj’s parents set him up on a blind date, he finds he can talk to women with the aid of alcohol.

  10. How Many Episodes Of "The Big Bang Theory" Have You 13

    10.

    The Cooper-Hofstadter Polarization(2008)

    Leonard and Sheldon’s friendship is put to the test when Leonard wants to present a paper they co-authored at a physics convention, but Sheldon doesn’t.

  11. How Many Episodes Of "The Big Bang Theory" Have You 14

    11.

    The Loobenfeld Decay(2008)

    Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too many loose ends, so he comes up with a new, unnecessarily complex one to replace it.

  12. How Many Episodes Of "The Big Bang Theory" Have You 15

    12.

    The Pancake Batter Anomaly(2008)

    When Sheldon gets sick, Leonard, Howard and Raj go AWOL, leaving a reluctant Penny to deal with him.

  13. How Many Episodes Of "The Big Bang Theory" Have You 16

    13.

    The Jerusalem Duality(2008)

    Sheldon decides to give up his work and focus on other tasks when a 15-year-old prodigy joins the university, so the other guys come up with a plan to get rid of him.

  14. How Many Episodes Of "The Big Bang Theory" Have You 17

    14.

    The Bat Jar Conjecture(2008)

    Sheldon becomes so intent on demonstrating his intellectual superiority over the other guys that they kick him off the Physics Bowl team and replace him with his nemesis, Leslie.

  15. How Many Episodes Of "The Big Bang Theory" Have You 18

    15.

    The Nerdvana Annihilation(2008)

    Penny gets mad at the guys when their full scale model of a time machine causes her to miss work, which prompts Leonard to give up all of his nerd memorabilia.

  16. How Many Episodes Of "The Big Bang Theory" Have You 19

    16.

    The Pork Chop Indeterminacy(2008)

    Leonard, Howard and Raj fight over Sheldon’s twin sister when she arrives in town. Raj takes part in a drug trial to suppress his selective mutism.

  17. How Many Episodes Of "The Big Bang Theory" Have You 20

    17.

    The Peanut Reaction(2008)

    When Penny learns that Leonard has never had a birthday party, she and the rest of the guys plan a surprise party for him.

  18. How Many Episodes Of "The Big Bang Theory" Have You 21

    18.

    The Tangerine Factor(2008)

    After a bad breakup, Penny finally agrees to go out on a date with Leonard, however they both develop doubts and turn to Sheldon for advice.

  19. Season 2

  20. How Many Episodes Of "The Big Bang Theory" Have You 22

    19.

    The Bad Fish Paradigm(2008)

    Leonard becomes concerned when his date with Penny ends abruptly and she starts blowing him off. When told the truth, Sheldon would rather move out than keep Penny’s reasons a secret from Leonard.

  21. How Many Episodes Of "The Big Bang Theory" Have You 23

    20.

    The Codpiece Topology(2008)

    Sheldon is annoyed when Leonard turns to Leslie for comfort after seeing Penny with another guy.

  22. How Many Episodes Of "The Big Bang Theory" Have You 24

    21.

    The Barbarian Sublimation(2008)

    Sheldon introduces Penny to online gaming, however she refuses to quit after becoming addicted.

  23. How Many Episodes Of "The Big Bang Theory" Have You 25

    22.

    The Griffin Equivalency(2008)

    The guys struggle to cope with Raj’s arrogance after he is featured in a People magazine article.

  24. How Many Episodes Of "The Big Bang Theory" Have You 26

    23.

    The Euclid Alternative(2008)

    Sheldon annoys the gang when Leonard can’t drive him to and from work, so they try to teach him how to drive.

  25. How Many Episodes Of "The Big Bang Theory" Have You 27

    24.

    The Cooper-Nowitzki Theorem(2008)

    Sheldon is flattered when a graduate student takes a shine to him, however her extreme devotion becomes too much to handle.

  26. How Many Episodes Of "The Big Bang Theory" Have You 28

    25.

    The Panty Piñata Polarization(2008)

    Penny plans revenge when Sheldon bans her from his and Leonard’s apartment, while Howard and Raj use the latest technology to try to find the house being used in “America’s Next Top Model.”

  27. How Many Episodes Of "The Big Bang Theory" Have You 29

    26.

    The Lizard-Spock Expansion(2008)

    Leonard and Howard’s friendship is jeopardised when Leonard steals a girl from Howard.

  28. How Many Episodes Of "The Big Bang Theory" Have You 30

    27.

    The White Asparagus Triangulation(2008)

    Sheldon believes that Leonard will wreck his relationship with Stephanie, so he decides to take matters into his own hands.

  29. How Many Episodes Of "The Big Bang Theory" Have You 31

    28.

    The Vartabedian Conundrum(2008)

    Leonard tries to slow down his relationship with Stephanie when he realizes that they are living together, while Sheldon becomes convinced that he has an untraceable disease.

  30. How Many Episodes Of "The Big Bang Theory" Have You 32

    29.

    The Bath Item Gift Hypothesis(2008)

    Leonard is disappointed when Penny develops an interest in an attractive physicist at the university. Meanwhile, Sheldon struggles to find an appropriate Christmas gift for Penny.

  31. How Many Episodes Of "The Big Bang Theory" Have You 33

    30.

    The Killer Robot Instability(2009)

    Howard becomes depressed after Penny makes a cruel statement about his love life, while the rest of the guys prepare for a grudge killer robot duel against an obnoxious colleague at the university.

  32. How Many Episodes Of "The Big Bang Theory" Have You 34

    31.

    The Friendship Algorithm(2009)

    Sheldon tries to make friends with Kripke in the hope that it will get him access to a coveted computer at the university.

  33. How Many Episodes Of "The Big Bang Theory" Have You 35

    32.

    The Financial Permeability(2009)

    Leonard and Sheldon try to help out Penny when she can’t afford to pay her rent.

  34. How Many Episodes Of "The Big Bang Theory" Have You 36

    33.

    The Maternal Capacitance(2009)

    Sheldon hits it off with Leonard’s psychoanalyst mother, but she drives Leonard and Penny to the bottle.

  35. How Many Episodes Of "The Big Bang Theory" Have You 37

    34.

    The Cushion Saturation(2009)

    Howard hooks up with Leslie, while Penny accidentally ruins Sheldon’s spot on the couch.

  36. How Many Episodes Of "The Big Bang Theory" Have You 38

    35.

    The Terminator Decoupling(2009)

    On a train to San Francisco, Howard, Raj and Leonard fight for the affections of sci-fi star Summer Glau, while Sheldon is forced to turn to Penny for help when he leaves his flash drive behind.

  37. How Many Episodes Of "The Big Bang Theory" Have You 39

    36.

    The Work Song Nanocluster(2009)

    Sheldon’s assistance with Penny’s home-based business leads to chaos.

  38. How Many Episodes Of "The Big Bang Theory" Have You 40
  39. How Many Episodes Of "The Big Bang Theory" Have You 41

    38.

    The Hofstadter Isotope(2009)

    Leonard is upset when the owner of the comic book store goes on a date with Penny, so he convinces Howard and Raj to take him to a bar so that he can pick up a woman of his own.

  40. How Many Episodes Of "The Big Bang Theory" Have You 42

    39.

    The Vegas Renormalization(2009)

    After being dumped by Leslie, Howard heads to Las Vegas with Leonard and Raj. Meanwhile, Penny is forced to take in Sheldon after he locks himself out of his apartment.

  41. How Many Episodes Of "The Big Bang Theory" Have You 43

    40.

    The Classified Materials Turbulence(2009)

    Penny’s second date with Stuart has significant implications for Leonard. Howard enlists the guys’ help with one of his NASA projects.

  42. How Many Episodes Of "The Big Bang Theory" Have You 44

    41.

    The Monopolar Expedition(2009)

    Penny gets upset when she finds out Leonard and the guys plan to work at the North Pole for the summer.

  43. Season 3

  44. How Many Episodes Of "The Big Bang Theory" Have You 45

    42.

    The Electric Can Opener Fluctuation(2009)

    After returning from the North Pole, a conflict among the guys sends Sheldon back to Texas and interferes with Leonard’s reunion with Penny.

  45. How Many Episodes Of "The Big Bang Theory" Have You 46

    43.

    The Jiminy Conjecture(2009)

    Leonard and Penny’s first night together goes awkwardly. Sheldon and Howard wager on the species of a cricket.

  46. How Many Episodes Of "The Big Bang Theory" Have You 47

    44.

    The Gothowitz Deviation(2009)

    Sheldon attempts to covertly alter Penny’s habits, while Howard and Raj try their luck meeting women at a Goth-style club.

  47. How Many Episodes Of "The Big Bang Theory" Have You 48

    45.

    The Pirate Solution(2009)

    When Raj has to find a new job or be sent back to India, Sheldon’s solution leaves Leonard and Penny dealing with Howard as the third wheel.

  48. How Many Episodes Of "The Big Bang Theory" Have You 49

    46.

    The Creepy Candy Coating Corollary(2009)

    Leonard is forced to ask Penny to set Howard up with one of her friends, while Sheldon seeks payback against sci-fi star Wil Wheaton.

  49. How Many Episodes Of "The Big Bang Theory" Have You 50

    47.

    The Cornhusker Vortex(2009)

    Leonard tries to learn about football to fit in with Penny’s friends. Meanwhile, a loss in a kite war threatens to end Raj and Howard’s friendship.

  50. How Many Episodes Of "The Big Bang Theory" Have You 51

    48.

    The Guitarist Amplification(2009)

    Sheldon is caught in the middle when Leonard and Penny argue about Penny’s friend staying at her apartment.

  51. How Many Episodes Of "The Big Bang Theory" Have You 52

    49.

    The Adhesive Duck Deficiency(2009)

    Penny is forced to turn to Sheldon for help when she dislocates her shoulder in the bathtub. Meanwhile, the rest of the guys accidentally get stoned in the desert while waiting for a meteor shower.

  52. How Many Episodes Of "The Big Bang Theory" Have You 53

    50.

    The Vengeance Formulation(2009)

    Sheldon plans revenge after Kripke humiliates him on the radio. Howard develops doubts about his relationship with Bernadette.

  53. How Many Episodes Of "The Big Bang Theory" Have You 54

    51.

    The Gorilla Experiment(2009)

    Sheldon attempts to help Penny understand physics to impress Leonard, while Howard becomes jealous when Bernadette takes an interest in Leonard’s research.

  54. How Many Episodes Of "The Big Bang Theory" Have You 55

    52.

    The Maternal Congruence(2009)

    Leonard’s mother makes a visit to his dismay and Sheldon’s delight.

  55. How Many Episodes Of "The Big Bang Theory" Have You 56

    53.

    The Psychic Vortex(2010)

    Raj talks Sheldon into being his wingman at a university mixer. Leonard has trouble dealing with Penny consulting a psychic.

  56. How Many Episodes Of "The Big Bang Theory" Have You 57

    54.

    The Bozeman Reaction(2010)

    When their apartment is robbed, Leonard and Sheldon turn to Howard and Raj to create a state-of-the-art security system.

  57. How Many Episodes Of "The Big Bang Theory" Have You 58

    55.

    The Einstein Approximation(2010)

    Sheldon wreaks havoc when he is stumped by a difficult physics question.

  58. How Many Episodes Of "The Big Bang Theory" Have You 59

    56.

    The Large Hadron Collision(2010)

    When Leonard is offered a trip to Switzerland on Valentine’s Day to visit the CERN laboratory, Sheldon uses any and all means to be his guest instead of Penny.

  59. How Many Episodes Of "The Big Bang Theory" Have You 60

    57.

    The Excelsior Acquisition(2010)

    Sheldon misses an opportunity to get Stan Lee’s autograph because he has to make an appearance in traffic court.

  60. How Many Episodes Of "The Big Bang Theory" Have You 61

    58.

    The Precious Fragmentation(2010)

    The guys’ friendship is threatened when they find a ring from the “Lord of the Rings” trilogy.

  61. How Many Episodes Of "The Big Bang Theory" Have You 62

    59.

    The Pants Alternative(2010)

    Sheldon seeks help from the rest of the gang in overcoming his fear of public speaking when he receives an award.

  62. How Many Episodes Of "The Big Bang Theory" Have You 63

    60.

    The Wheaton Recurrence(2010)

    Sheldon takes on Wil Wheaton in a game of bowling. Leonard and Penny’s relationship comes to a crossroad.

  63. How Many Episodes Of "The Big Bang Theory" Have You 64

    61.

    The Spaghetti Catalyst(2010)

    Sheldon is forced to go behind Leonard’s back to spend time with Penny following their breakup.

  64. How Many Episodes Of "The Big Bang Theory" Have You 65

    62.

    The Plimpton Stimulation(2010)

    Chaos ensues when a nymphomaniac physicist visiting Sheldon hooks up with Leonard.

  65. How Many Episodes Of "The Big Bang Theory" Have You 66

    63.

    The Staircase Implementation(2010)

    Leonard tells Penny about how he and Sheldon became roommates and what happened to the elevator.

  66. How Many Episodes Of "The Big Bang Theory" Have You 67

    64.

    The Lunar Excitation(2010)

    Penny has a night of angry, drunken sex with Leonard, much to his confusion. Meanwhile, Howard and Raj search for Sheldon’s perfect match online.

  67. Season 4

  68. How Many Episodes Of "The Big Bang Theory" Have You 68

    65.

    The Robotic Manipulation(2010)

    Penny ends up tagging along on Sheldon’s first ever date with Amy, while Howard finds an unusual use for a robotic arm.

  69. How Many Episodes Of "The Big Bang Theory" Have You 69

    66.

    The Cruciferous Vegetable Amplification(2010)

    When Sheldon calculates the technology to download his consciousness into a robot won’t be invented soon enough, he desperately tries to find a way to increase his lifespan.

  70. How Many Episodes Of "The Big Bang Theory" Have You 70

    67.

    The Zazzy Substitution(2010)

    Following his ‘breakup’ with Amy, the gang become concerned with Sheldon’s obsessive search for non-human companionship and call his mother to intervene.

  71. How Many Episodes Of "The Big Bang Theory" Have You 71

    68.

    The Hot Troll Deviation(2010)

    Howard tries to get Penny’s help in winning back Bernadette, but first has to confess the embarrassing reason why they broke up in the first place. Raj and Sheldon clash over a desk.

  72. How Many Episodes Of "The Big Bang Theory" Have You 72

    69.

    The Desperation Emanation(2010)

    Sheldon is scared that he is in a relationship when Amy asks him to meet her mother, and Leonard asks Howard and Bernadette to set him up because he is the only person in the group without a girlfriend.

  73. How Many Episodes Of "The Big Bang Theory" Have You 73

    70.

    The Irish Pub Formulation(2010)

    Leonard tries to keep everyone from finding out that he spent the night with Raj’s sister, but Sheldon finds out and concocts an elaborate story to help him keep the secret from Raj.

  74. How Many Episodes Of "The Big Bang Theory" Have You 74

    71.

    The Apology Insufficiency(2010)

    An FBI agent interviews the guys when Howard needs to obtain a security clearance.

  75. How Many Episodes Of "The Big Bang Theory" Have You 75

    72.

    The 21-Second Excitation(2010)

    The guys camp out all night waiting to see an extended cut of Indiana Jones, while Amy joins in on girls’ night with Penny and Bernadette.

  76. How Many Episodes Of "The Big Bang Theory" Have You 76

    73.

    The Boyfriend Complexity(2010)

    Penny asks Leonard to pose as her boyfriend when her father visits. Howard, Raj and Bernadette have an awkward encounter when they spend the evening together.

  77. How Many Episodes Of "The Big Bang Theory" Have You 77

    74.

    The Alien Parasite Hypothesis(2010)

    Amy finds she has sexual feelings for Penny’s ex-boyfriend Zack, while Raj and Howard try to prove who would be the better superhero.

  78. How Many Episodes Of "The Big Bang Theory" Have You 78

    75.

    The Justice League Recombination(2010)

    The guys enter a costume contest as members of the Justice League and convince Penny and Zack to join them.

  79. How Many Episodes Of "The Big Bang Theory" Have You 79

    76.

    The Bus Pants Utilization(2011)

    Leonard has an idea for a new smartphone app and asks the guys for help, however Sheldon tries to take over the project, and Leonard fires him.

  80. How Many Episodes Of "The Big Bang Theory" Have You 80

    77.

    The Love Car Displacement(2011)

    Chaos ensues when the gang spend the weekend together at a science convention.

  81. How Many Episodes Of "The Big Bang Theory" Have You 81

    78.

    The Thespian Catalyst(2011)

    To improve his skills as an instructor, Sheldon asks Penny to give him acting lessons. Meanwhile, Raj begins having impure fantasies about Bernadette.

  82. How Many Episodes Of "The Big Bang Theory" Have You 82

    79.

    The Benefactor Factor(2011)

    To secure needed funding for the university, Sheldon convinces Leonard to get friendly with a wealthy benefactor.

  83. How Many Episodes Of "The Big Bang Theory" Have You 83

    80.

    The Cohabitation Formulation(2011)

    Bernadette makes Howard choose between herself and his mother, while Penny and Raj become upset when Priya returns to town and resumes her relationship with Leonard.

  84. How Many Episodes Of "The Big Bang Theory" Have You 84

    81.

    The Toast Derivation(2011)

    Sheldon becomes concerned when everybody begins to hang out at Raj’s apartment and discovers Leonard is the center of the group.

  85. How Many Episodes Of "The Big Bang Theory" Have You 85

    82.

    The Prestidigitation Approximation(2011)

    Priya forces Leonard to choose between a relationship with her or a friendship with Penny. A magic trick by Howard has Sheldon fooled.

  86. How Many Episodes Of "The Big Bang Theory" Have You 86

    83.

    The Zarnecki Incursion(2011)

    The guys go all out to help Sheldon find the person responsible for hacking his online gaming account, while the girls’ hatred for Priya increases.

  87. How Many Episodes Of "The Big Bang Theory" Have You 87

    84.

    The Herb Garden Germination(2011)

    Sheldon and Amy secretly experiment on the gang by spreading rumors when they hear that Bernadette is thinking about breaking up with Howard.

  88. How Many Episodes Of "The Big Bang Theory" Have You 88

    85.

    The Agreement Dissection(2011)

    When Priya finds a loophole in the roommate agreement to throw Sheldon out for the night, Penny, Amy and Bernadette take him to a nightclub.

  89. How Many Episodes Of "The Big Bang Theory" Have You 89

    86.

    The Wildebeest Implementation(2011)

    Sheldon invents a three-player chess game, Penny and Amy use Bernadette to spy on Leonard and Priya, and Raj tries a new drug to treat his social anxiety.

  90. How Many Episodes Of "The Big Bang Theory" Have You 90

    87.

    The Engagement Reaction(2011)

    Howard believes that his mom suffered a heart attack because he told her that he’s marrying Bernadette, Sheldon freaks out over germs, and Penny and Priya compare notes on Leonard.

  91. How Many Episodes Of "The Big Bang Theory" Have You 91

    88.

    The Roommate Transmogrification(2011)

    Raj moves in with Sheldon after hearing Leonard and Priya engage in a Star Trek fantasy in his apartment. Bernadette receives her doctorate.

  92. Season 5

  93. How Many Episodes Of "The Big Bang Theory" Have You 92
  94. How Many Episodes Of "The Big Bang Theory" Have You 93

    90.

    The Infestation Hypothesis(2011)

    Amy gets inadvertently caught in the middle of a fight between Sheldon and Penny over a chair. Leonard tries to add some spice to his long-distance relationship with Priya.

  95. How Many Episodes Of "The Big Bang Theory" Have You 94

    91.

    The Pulled Groin Extrapolation(2011)

    Leonard accompanies Amy to a colleague’s wedding. Howard tries to convince Bernadette to live with his mother after they get married.

  96. How Many Episodes Of "The Big Bang Theory" Have You 95

    92.

    The Wiggly Finger Catalyst(2011)

    Penny sets up Raj with a deaf friend, not knowing that she’s actually a gold digger, and Sheldon decides to let his minor decisions rest on the roll of the dice.

  97. How Many Episodes Of "The Big Bang Theory" Have You 96

    93.

    The Russian Rocket Reaction(2011)

    Sheldon takes offense when Leonard wants to attend a party with Wil Wheaton, while Bernadette tries to block Howard’s opportunity to go into outer space.

  98. How Many Episodes Of "The Big Bang Theory" Have You 97

    94.

    The Rhinitis Revelation(2011)

    Sheldon gets upset when his mother comes to visit but refuses to cook for him and attend physics lectures.

  99. How Many Episodes Of "The Big Bang Theory" Have You 98

    95.

    The Good Guy Fluctuation(2011)

    Sheldon tries to get into the spirit of Halloween by trying to scare the guys after they prank him. Leonard seeks Penny’s advice when an attractive comic book artist takes an interest in him.

  100. How Many Episodes Of "The Big Bang Theory" Have You 99

    96.

    The Isolation Permutation(2011)

    Amy is hurt when Penny and Bernadette go bridesmaid dress shopping without her, so she turns to a reluctant Sheldon for comfort.

  101. How Many Episodes Of "The Big Bang Theory" Have You 100

    97.

    The Ornithophobia Diffusion(2011)

    Sheldon tries to overcome his fear of birds, while Leonard and Penny attempt to hang out together strictly as friends.

  102. How Many Episodes Of "The Big Bang Theory" Have You 101

    98.

    The Flaming Spittoon Acquisition(2011)

    When Stuart asks Amy on a date, Sheldon considers having a more serious relationship with her. Meanwhile, the guys become obsessed with a new card game involving Wild West heroes and witches.

  103. How Many Episodes Of "The Big Bang Theory" Have You 102

    99.

    The Speckerman Recurrence(2011)

    Leonard confronts the man who bullied him in high school, while Penny realizes she did her fair share of tormenting in the past.

  104. How Many Episodes Of "The Big Bang Theory" Have You 103

    100.

    The Shiny Trinket Maneuver(2012)

    Penny helps Sheldon work on his relationship with Amy when he trivializes one of her accomplishments. Howard is irked by Bernadette’s dislike of children.

  105. How Many Episodes Of "The Big Bang Theory" Have You 104
  106. How Many Episodes Of "The Big Bang Theory" Have You 105

    102.

    The Beta Test Initiation(2012)

    Leonard and Penny develop a system to ensure their dates go smoothly. Raj finally finds a woman he can talk to – the virtual assistant on his mobile phone.

  107. How Many Episodes Of "The Big Bang Theory" Have You 106

    103.

    The Friendship Contraction(2012)

    Leonard signs out of his roommate agreement, reducing himself and Sheldon to mere acquaintances, while Howard tries to think of a cool astronaut nickname for himself.

  108. How Many Episodes Of "The Big Bang Theory" Have You 107

    104.

    The Vacation Solution(2012)

    When the university forces Sheldon to use vacation days, he decides to hang out in Amy’s lab. Howard becomes upset when he hears Bernadette wants him to sign a prenuptial agreement.

  109. How Many Episodes Of "The Big Bang Theory" Have You 108

    105.

    The Rothman Disintegration(2012)

    Sheldon battles Kripke for a coveted office at the university. Penny receives a very unusual gift from Amy.

  110. How Many Episodes Of "The Big Bang Theory" Have You 109

    106.

    The Werewolf Transformation(2012)

    Sheldon wreaks havoc when he tries to get a haircut from his regular barber, who is ill. Howard runs into a few problems with astronaut training.

  111. How Many Episodes Of "The Big Bang Theory" Have You 110

    107.

    The Weekend Vortex(2012)

    Sheldon has to choose between joining Amy at her aunt’s birthday party or playing videogames all weekend with the guys.

  112. How Many Episodes Of "The Big Bang Theory" Have You 111

    108.

    The Transporter Malfunction(2012)

    Raj gets quite a surprise when he asks his parents to set him up on a date. Penny buys Leonard and Sheldon a pair of Star Trek keepsake collectibles.

  113. How Many Episodes Of "The Big Bang Theory" Have You 112

    109.

    The Hawking Excitation(2012)

    Sheldon uses any and all means to meet his hero, Dr. Stephen Hawking.

  114. How Many Episodes Of "The Big Bang Theory" Have You 113

    110.

    The Stag Convergence(2012)

    The guys throw Howard a bachelor party, and some embarrassing details about his life get posted on the Internet.

  115. How Many Episodes Of "The Big Bang Theory" Have You 114

    111.

    The Launch Acceleration(2012)

    NASA cancel, and later reinstate Howard’s mission into space, coinciding with his wedding. Leonard inadvertently jeopardizes his relationship with Penny.

  116. How Many Episodes Of "The Big Bang Theory" Have You 115

    112.

    The Countdown Reflection(2012)

    As Howard prepares for his mission into space, flashbacks show the recent events leading up to his and Bernadette’s wedding.

  117. Season 6

  118. How Many Episodes Of "The Big Bang Theory" Have You 116

    113.

    The Date Night Variable(2012)

    Raj crashes Sheldon and Amy’s second anniversary and interferes in Leonard and Penny’s relationship. Howard gets caught in the middle of an argument between Bernadette and his mother.

  119. How Many Episodes Of "The Big Bang Theory" Have You 117

    114.

    The Decoupling Fluctuation(2012)

    Penny continues to have doubts about her relationship with Leonard. Meanwhile, Howard becomes the target of practical jokes on the space station.

  120. How Many Episodes Of "The Big Bang Theory" Have You 118

    115.

    The Higgs Boson Observation(2012)

    When Sheldon hires a female grad student to assist him, a jealous Amy asks Penny to help her spy on them. On the space station, Howard begins behaving erratically.

  121. How Many Episodes Of "The Big Bang Theory" Have You 119

    116.

    The Re-Entry Minimization(2012)

    Howard is offended when his return from space is met with little fanfare. Penny and Amy take on Sheldon and Leonard during game night.

  122. How Many Episodes Of "The Big Bang Theory" Have You 120

    117.

    The Holographic Excitation(2012)

    While Raj plans Stuart’s Halloween party at the comic book store, Howard annoys the rest of the gang by constantly talking about space, and Penny tries to take more of an interest in Leonard’s work.

  123. How Many Episodes Of "The Big Bang Theory" Have You 121

    118.

    The Extract Obliteration(2012)

    Penny enrolls in a college class and keeps it a secret from Leonard. Sheldon causes conflict with Dr. Stephen Hawking over an online game.

  124. How Many Episodes Of "The Big Bang Theory" Have You 122

    119.

    The Habitation Configuration(2012)

    Howard makes a decision whether or not to move out of his mother’s house, while Sheldon is caught in the middle of an argument between Amy and Wil Wheaton.

  125. How Many Episodes Of "The Big Bang Theory" Have You 123

    120.

    The 43 Peculiarity(2012)

    Leonard feels threatened after hearing about Penny’s study partner at school, while Howard and Raj become determined to find out one of Sheldon’s secrets.

  126. How Many Episodes Of "The Big Bang Theory" Have You 124

    121.

    The Parking Spot Escalation(2012)

    The gang are drawn into a fight between Howard and Sheldon over Sheldon’s vacant parking spot at the university.

  127. How Many Episodes Of "The Big Bang Theory" Have You 125

    122.

    The Fish Guts Displacement(2012)

    Howard tries to bond with Bernadette’s father during a fishing trip. When Sheldon is obligated to take care of a sick Amy, she finds ways to take advantage of the situation.

  128. How Many Episodes Of "The Big Bang Theory" Have You 126

    123.

    The Santa Simulation(2012)

    The girls take Raj out to a nightclub to find him a date. A game of Dungeons and Dragons rekindle old memories of Santa for Sheldon.

  129. How Many Episodes Of "The Big Bang Theory" Have You 127

    124.

    The Egg Salad Equivalency(2013)

    When Penny finds out Alex has a crush on Leonard, Sheldon gets himself and the rest of the guys in trouble with Human Resources whilst trying to solve the problem.

  130. How Many Episodes Of "The Big Bang Theory" Have You 128

    125.

    The Bakersfield Expedition(2013)

    The guys are stranded in the middle of nowhere when Leonard’s car is stolen on the way to the Bakersfield Comic-Con. Back home, the girls try to figure out why the guys are so fascinated with comic books.

  131. How Many Episodes Of "The Big Bang Theory" Have You 129

    126.

    The Cooper/Kripke Inversion(2013)

    Sheldon is forced to work with Kripke on a project and must concoct an elaborate lie when he can’t hold up his end of the work. Howard and Raj get superhero figurines made of themselves.

  132. How Many Episodes Of "The Big Bang Theory" Have You 130

    127.

    The Spoiler Alert Segmentation(2013)

    Leonard moves in with Penny after a fight with Sheldon, which causes Amy to want to move in with Sheldon. Meanwhile, Raj has a frightening experience with Howard’s mother.

  133. How Many Episodes Of "The Big Bang Theory" Have You 131

    128.

    The Tangible Affection Proof(2013)

    Sheldon gets Alex to buy a Valentine’s Day gift for Amy. Leonard, Penny, Howard and Bernadette have a disastrous dinner together. Raj and Stuart host a “Lonely People” party at the comic book store.

  134. How Many Episodes Of "The Big Bang Theory" Have You 132

    129.

    The Monster Isolation(2013)

    Raj falls apart after his date sneaks out on him, and Sheldon reluctantly returns the favor after Penny helps him out with his “Fun With Flags” program.

  135. How Many Episodes Of "The Big Bang Theory" Have You 133

    130.

    The Contractual Obligation Implementation(2013)

    Leonard, Sheldon and Howard give lectures on science to junior high students. The girls ditch work to go to Disneyland. Raj devises a date for Lucy that fixes their social anxiety problems.

  136. How Many Episodes Of "The Big Bang Theory" Have You 134

    131.

    The Closet Reconfiguration(2013)

    Howard becomes upset when Sheldon finds a letter from his estranged father whilst cleaning out his and Bernadette’s closet.

  137. How Many Episodes Of "The Big Bang Theory" Have You 135

    132.

    The Tenure Turbulence(2013)

    Leonard, Sheldon, Raj and Kripke battle for tenure at the university.

  138. How Many Episodes Of "The Big Bang Theory" Have You 136

    133.

    The Closure Alternative(2013)

    Amy tries to help a depressed Sheldon find closure when one of his favorite TV shows is canceled. Raj becomes paranoid when he finds Lucy’s blog.

  139. How Many Episodes Of "The Big Bang Theory" Have You 137

    134.

    The Proton Resurgence(2013)

    Bernadette and Howard offer to watch Raj’s dog and live to regret it. Leonard and Sheldon hire their favorite childhood star to make an appearance.

  140. How Many Episodes Of "The Big Bang Theory" Have You 138

    135.

    The Love Spell Potential(2013)

    A date between Raj and Lucy takes both of them out of their comfort zones. After a trip to Las Vegas goes awry, the girls join in on a Dungeons and Dragons game, which causes Amy and Sheldon to re-evaluate their relationship.

  141. How Many Episodes Of "The Big Bang Theory" Have You 139

    136.

    The Bon Voyage Reaction(2013)

    Penny is thrown for a loop when Leonard is offered a job overseas, but the news is an even bigger shock to Sheldon. Raj and Lucy’s relationship comes to a crossroad.

  142. Season 7

  143. How Many Episodes Of "The Big Bang Theory" Have You 140

    137.

    The Hofstadter Insufficiency(2013)

    Sheldon and Penny bond over missing Leonard. Howard tries to help Raj get over his breakup with Lucy. Amy and Bernadette take a trip together to a biology convention.

  144. How Many Episodes Of "The Big Bang Theory" Have You 141

    138.

    The Deception Verification(2013)

    Sheldon feels betrayed when Leonard returns from the North Sea and wants to spend his time with Penny instead of him. Howard’s latest foray into helping his mother has some disastrous side effects.

  145. How Many Episodes Of "The Big Bang Theory" Have You 142

    139.

    The Scavenger Vortex(2013)

    The gang get competitive when they are forced to take part in Raj’s scavenger hunt.

  146. How Many Episodes Of "The Big Bang Theory" Have You 143

    140.

    The Raiders Minimization(2013)

    Sheldon gets mad at Amy for ruining one of his favorite movies, Raj and Stuart try to make their online dating profiles more appealing, and Leonard tries to play the sympathy card with Penny.

  147. How Many Episodes Of "The Big Bang Theory" Have You 144

    141.

    The Workplace Proximity(2013)

    After a fight with Bernadette, Howard ends up on Raj’s couch. Sheldon and Amy clash when Amy takes a job at the university.

  148. How Many Episodes Of "The Big Bang Theory" Have You 145

    142.

    The Romance Resonance(2013)

    Howard plans something special to celebrate the anniversary of his first date with Bernadette. Sheldon is conflicted when he makes a major scientific breakthrough but some details have to be corrected.

  149. How Many Episodes Of "The Big Bang Theory" Have You 146

    143.

    The Proton Displacement(2013)

    Sheldon seeks payback when Arthur “Professor Proton” Jeffries asks Leonard for help on a project instead of him. Raj gets upset at Howard for crashing his night with the girls.

  150. How Many Episodes Of "The Big Bang Theory" Have You 147

    144.

    The Itchy Brain Simulation(2013)

    Sheldon demands Leonard make up for a mistake from their past. Penny confronts Raj’s ex-girlfriend, Lucy.

  151. How Many Episodes Of "The Big Bang Theory" Have You 148

    145.

    The Thanksgiving Decoupling(2013)

    The gang spend Thanksgiving at Mrs. Wolowitz’s house. Howard tries to bond with his father-in-law, and a mistake from Penny’s past comes back to haunt her.

  152. How Many Episodes Of "The Big Bang Theory" Have You 149

    146.

    The Discovery Dissipation(2013)

    Leonard has to deal with the fallout of disproving Sheldon’s new scientific discovery. Raj spends a week at Howard and Bernadette’s apartment.

  153. How Many Episodes Of "The Big Bang Theory" Have You 150

    147.

    The Cooper Extraction(2013)

    While Sheldon is at home in Texas, the rest of the gang decorate for Christmas and think about how much he has affected their lives.

  154. How Many Episodes Of "The Big Bang Theory" Have You 151

    148.

    The Hesitation Ramification(2014)

    After Leonard tries to help Penny following a failed role on a TV show, she makes an important decision. Meanwhile, Raj and Stuart try to practice their social skills, and Sheldon navigates the intricacies of being funny.

  155. How Many Episodes Of "The Big Bang Theory" Have You 152

    149.

    The Occupation Recalibration(2014)

    Sheldon tries to relax after he is forced to take a vacation. Leonard struggles to be supportive of Penny after she quits her job. Amy receives unwanted attention from a co-worker. Bernadette seeks Stuart’s help in replacing one of Howard’s comic books.

  156. How Many Episodes Of "The Big Bang Theory" Have You 153

    150.

    The Convention Conundrum(2014)

    When the guys can’t get hold of any Comic-Con tickets, Sheldon tries to hold his own convention and ends up spending a wild night with James Earl Jones. Meanwhile, the girls try to feel more mature by going to a fancy hotel for tea.

  157. How Many Episodes Of "The Big Bang Theory" Have You 154

    151.

    The Locomotive Manipulation(2014)

    Sheldon and Amy take a train ride to Napa Valley with Howard and Bernadette on Valentine’s Day. Leonard and Penny take Raj’s dog to the vet when she accidentally eats some chocolate.

  158. How Many Episodes Of "The Big Bang Theory" Have You 155

    152.

    The Table Polarization(2014)

    Leonard’s purchase of a dining room table causes Sheldon to reevaluate the changes in his life. Meanwhile, Howard is offered a chance to go back to space and Bernadette struggles with whether or not to encourage him.

  159. How Many Episodes Of "The Big Bang Theory" Have You 156

    153.

    The Friendship Turbulence(2014)

    After arguing with Sheldon, Howard tries to make amends by taking him to NASA headquarters in Houston. Penny has second thoughts about quitting her waitressing job when her car dies. Amy gets involved in trying to find Raj a date.

  160. How Many Episodes Of "The Big Bang Theory" Have You 157

    154.

    The Mommy Observation(2014)

    When Sheldon visits his mother in Houston, he is forced to confront a new reality. Back in Pasadena, the rest of the gang reluctantly take part in Raj’s Murder Mystery party.

  161. How Many Episodes Of "The Big Bang Theory" Have You 158

    155.

    The Indecision Amalgamation(2014)

    While Raj is wracked with guilt when he tries to date Lucy and Emily at the same time, Penny wrestles with whether to take a role in a cheesy movie and Sheldon is torn trying to choose between two gaming systems.

  162. How Many Episodes Of "The Big Bang Theory" Have You 159

    156.

    The Relationship Diremption(2014)

    Penny tries to help Sheldon when he reconsiders his “relationship” with String Theory. During a dinner with Howard and Bernadette, Raj discovers Howard once embarrassed himself on a date with Emily.

  163. How Many Episodes Of "The Big Bang Theory" Have You 160

    157.

    The Anything Can Happen Recurrence(2014)

    When Sheldon tries to be spontaneous, it leads to unexpected friction between the girls. Meanwhile, Raj seeks Howard’s help in preparing for a date with Emily.

  164. How Many Episodes Of "The Big Bang Theory" Have You 161

    158.

    The Proton Transmogrification(2014)

    As the gang celebrate Star Wars Day, Sheldon has difficulty dealing with the recent death of Arthur “Professor Proton” Jeffries.

  165. How Many Episodes Of "The Big Bang Theory" Have You 162

    159.

    The Gorilla Dissolution(2014)

    Penny gets fired from her movie and takes a serious look at her life. Raj sees Emily on a date with another man at the movies. Howard and Bernadette have to take care of his mother after she breaks her leg.

  166. How Many Episodes Of "The Big Bang Theory" Have You 163

    160.

    The Status Quo Combustion(2014)

    Sheldon gets upset about his career, the destruction of the comic book store and Leonard and Penny’s future living arrangements. Howard and Bernadette struggle to keep hold of a caregiver for Mrs. Wolowitz.

  167. Season 8

  168. How Many Episodes Of "The Big Bang Theory" Have You 164

    161.

    The Locomotion Interruption(2014)

    Sheldon’s trip comes to an end when he is robbed, Penny interviews for a job at Bernadette’s company, and Howard is weirded out by his mother’s relationship with Stuart.

  169. How Many Episodes Of "The Big Bang Theory" Have You 165

    162.

    The Junior Professor Solution(2014)

    Sheldon is forced to teach a class as a Junior Professor. Meanwhile, Amy plays both sides when tension arises between Penny and Bernadette.

  170. How Many Episodes Of "The Big Bang Theory" Have You 166

    163.

    The First Pitch Insufficiency(2014)

    Howard becomes nervous after NASA asks him to throw out the first pitch at a Los Angeles Angels game. Meanwhile, Leonard and Penny try to prove Sheldon wrong when he says that he and Amy have a ‘superior’ relationship.

  171. How Many Episodes Of "The Big Bang Theory" Have You 167

    164.

    The Hook-up Reverberation(2014)

    Raj’s honesty about his past comes back to haunt him after Emily takes a dislike to Penny. Meanwhile, the guys consider investing in the comic book store.

  172. How Many Episodes Of "The Big Bang Theory" Have You 168

    165.

    The Focus Attenuation(2014)

    The girls head to Las Vegas, while the guys try to invent something cool, but only come up with new ways to procrastinate.

  173. How Many Episodes Of "The Big Bang Theory" Have You 169

    166.

    The Expedition Approximation(2014)

    Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel. Meanwhile, Leonard and Penny seek advice from Howard and Bernadette when they argue about money.

  174. How Many Episodes Of "The Big Bang Theory" Have You 170

    167.

    The Misinterpretation Agitation(2014)

    The guys befriend one of Penny’s clients when he shows up at her apartment. Meanwhile, Bernadette gets upset when Amy torpedoes an article about her for a local magazine.

  175. How Many Episodes Of "The Big Bang Theory" Have You 171

    168.

    The Prom Equivalency(2014)

    The girls decide to re-enact their high school proms with the guys. While Sheldon feels under pressure to commit to his relationship with Amy, Howard worries about who Stuart will bring as his date.

  176. How Many Episodes Of "The Big Bang Theory" Have You 172

    169.

    The Septum Deviation(2014)

    Sheldon panics when Leonard announces he has to go into the hospital for surgery. Raj discovers his parents have divorced.

  177. How Many Episodes Of "The Big Bang Theory" Have You 173

    170.

    The Champagne Reflection(2014)

    While Sheldon retires “Fun With Flags”, Leonard, Howard and Raj look for something significant in a dead professor’s research, and Bernadette finds out what her colleagues really think of her.

  178. How Many Episodes Of "The Big Bang Theory" Have You 174

    171.

    The Clean Room Infiltration(2014)

    Amy hosts a traditional Victorian Christmas Eve dinner as Raj’s father comes to visit, while the guys try to shoo out a bird they let into the university clean room.

  179. How Many Episodes Of "The Big Bang Theory" Have You 175

    172.

    The Space Probe Disintegration(2015)

    Raj worries a probe he designed will not work in outer space, while Leonard and Sheldon go shopping with Penny and Amy.

  180. How Many Episodes Of "The Big Bang Theory" Have You 176

    173.

    The Anxiety Optimization(2015)

    When Sheldon becomes stuck in a rut with his work, the gang try to help him by raising his stress levels. Howard teases Raj with a game called “Emily or Cinnamon.”

  181. How Many Episodes Of "The Big Bang Theory" Have You 177

    174.

    The Troll Manifestation(2015)

    Leonard and Sheldon defend themselves against criticism from an online bully, while the girls confront embarrassing moments from their pasts.

  182. How Many Episodes Of "The Big Bang Theory" Have You 178

    175.

    The Comic Book Store Regeneration(2015)

    Howard receives some shocking news as everyone prepares for the re-opening of the comic book store. Meanwhile, Penny tries to teach Sheldon how to “let it go,” but can’t follow her own advice when she learns something infuriating about Amy.

  183. How Many Episodes Of "The Big Bang Theory" Have You 179

    176.

    The Intimacy Acceleration(2015)

    Sheldon and Penny agree to participate in an unusual experiment. Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a “zombie”. Howard and Bernadette run into trouble at the airport after returning from Mrs. Wolowitz’s funeral.

  184. How Many Episodes Of "The Big Bang Theory" Have You 180

    177.

    The Colonization Application(2015)

    A trip to the pet store ends in a fight after Amy learns Sheldon has applied for a one-way mission to colonize Mars. Meanwhile, Leonard surprises Penny with a very “adult” purchase, and Raj gets into trouble when he snoops around Emily’s apartment.

  185. How Many Episodes Of "The Big Bang Theory" Have You 181

    178.

    The Leftover Thermalization(2015)

    Tension arises when a magazine fails to mention Leonard in an article about the paper he co-wrote with Sheldon, and a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor.

  186. How Many Episodes Of "The Big Bang Theory" Have You 182

    179.

    The Skywalker Incursion(2015)

    When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try and meet one of their idols. Meanwhile, while cleaning out Mrs. Wolowitz’s house, a ping pong battle ensues when Howard and Bernadette argue over the fate of his TARDIS.

  187. How Many Episodes Of "The Big Bang Theory" Have You 183

    180.

    The Fortification Implementation(2015)

    Howard meets the half-brother he never knew he had. Penny is invited to appear on Wil Wheaton’s podcast.

  188. How Many Episodes Of "The Big Bang Theory" Have You 184

    181.

    The Communication Deterioration(2015)

    When Raj is asked to create a message on the off chance a NASA mission discovers alien life, the guys fight over what he should do, while Penny contemplates returning to acting.

  189. How Many Episodes Of "The Big Bang Theory" Have You 185

    182.

    The Graduation Transmission(2015)

    Howard questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. A cancelled flight nearly prevents Leonard from giving the commencement address at his former high school. Raj pits his parents against each other when his father cuts him off financially.

  190. How Many Episodes Of "The Big Bang Theory" Have You 186

    183.

    The Maternal Combustion(2015)

    Personalities collide when Leonard and Sheldon’s mothers meet for the first time. Bernadette reaches her limit with Howard and Stuart.

  191. How Many Episodes Of "The Big Bang Theory" Have You 187

    184.

    The Commitment Determination(2015)

    As Sheldon presses Leonard and Penny to set a wedding date, he encounters major changes in his relationship with Amy. Meanwhile, Raj wonders if he should break up with Emily, and Howard and Bernadette struggle to ask Stuart to move out.

  192. Season 9

  193. How Many Episodes Of "The Big Bang Theory" Have You 188

    185.

    The Matrimonial Momentum(2015)

    Penny struggles with Leonard’s confession that he kissed another woman as they prepare to get married in Las Vegas. Meanwhile, Sheldon doesn’t know what to do after Amy pushes pause on their relationship.

  194. How Many Episodes Of "The Big Bang Theory" Have You 189

    186.

    The Separation Oscillation(2015)

    Leonard and Penny try to work through their marital issues. Meanwhile, Sheldon films a special episode of “Fun with Flags” after his breakup with Amy, and Bernadette feels guilty about withholding a secret from Penny.

  195. How Many Episodes Of "The Big Bang Theory" Have You 190

    187.

    The Bachelor Party Corrosion(2015)

    The guys’s skills are put to the test when they get a flat tire on the way to Mexico for Leonard’s bachelor party. The girls throw Penny a mini-bachelorette party.

  196. How Many Episodes Of "The Big Bang Theory" Have You 191

    188.

    The 2003 Approximation(2015)

    An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard. Raj and Howard form a band for the comic book store.

  197. How Many Episodes Of "The Big Bang Theory" Have You 192

    189.

    The Perspiration Implementation(2015)

    Kripke expresses interest in Amy while leading a fencing lesson for the guys. Meanwhile, Stuart seeks help from the girls in getting more women interested in the comic book store.

  198. How Many Episodes Of "The Big Bang Theory" Have You 193

    190.

    The Helium Insufficiency(2015)

    Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage. Meanwhile, the rest of the gang try to find Amy a new boyfriend on a dating app.

  199. How Many Episodes Of "The Big Bang Theory" Have You 194

    191.

    The Spock Resonance(2015)

    While being interviewed for a documentary about Spock from [link=tt0060028], Sheldon struggles to suppress his emotions about his recent break-up from Amy. Meanwhile, Howard and Bernadette butt heads over renovating his mother’s house.

  200. How Many Episodes Of "The Big Bang Theory" Have You 195

    192.

    The Mystery Date Observation(2015)

    Sheldon, Howard and Raj post an ad online to find a new girlfriend for Sheldon. Penny and Bernadette decide to spy when Amy is secretive about who she is dating.

  201. How Many Episodes Of "The Big Bang Theory" Have You 196

    193.

    The Platonic Permutation(2015)

    On Thanksgiving, Sheldon and Amy try to spend time together as friends and go to an aquarium, Howard reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily, and Penny discovers that Leonard knows more about her than she thought.

  202. How Many Episodes Of "The Big Bang Theory" Have You 197

    194.

    The Earworm Reverberation(2015)

    Sheldon has a revelation when he realizes why a song was stuck in his head. Meanwhile, Amy invites Dave over for dinner despite their previously awkward date, and Howard and Raj become obsessed with a fan of their band.

  203. How Many Episodes Of "The Big Bang Theory" Have You 198

    195.

    The Opening Night Excitation(2015)

    Leonard, Howard and Raj have to decide who will take their extra Star Wars movie ticket, while Sheldon plans something special for Amy’s birthday.

  204. How Many Episodes Of "The Big Bang Theory" Have You 199

    196.

    The Sales Call Sublimation(2016)

    Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist on her behalf to make a sale. Meanwhile, Sheldon and Raj collaborate on an astronomical discovery, and Howard and Bernadette’s happiness is short-lived after Stuart moves out.

  205. How Many Episodes Of "The Big Bang Theory" Have You 200

    197.

    The Empathy Optimization(2016)

    After being forced to deal with a sick Sheldon, the rest of the gang try to treat themselves to a Sheldon-free weekend.

  206. How Many Episodes Of "The Big Bang Theory" Have You 201

    198.

    The Meemaw Materialization(2016)

    Sheldon is thrilled when his Meemaw comes to visit, but his excitement quickly fades when she butts heads with Amy. Meanwhile, Raj meets a girl at the comic book store who makes him question his relationship with Emily.

  207. How Many Episodes Of "The Big Bang Theory" Have You 202

    199.

    The Valentino Submergence(2016)

    Sheldon and Amy host a Valentine’s Day episode of “Fun with Flags”, Leonard and Penny grapple with getting older, Howard and Bernadette find a surprise in their hot tub and Raj is torn between Emily and Claire.

  208. How Many Episodes Of "The Big Bang Theory" Have You 203
  209. How Many Episodes Of "The Big Bang Theory" Have You 204
  210. How Many Episodes Of "The Big Bang Theory" Have You 205

    202.

    The Application Deterioration(2016)

    Leonard, Sheldon, and Howard run into problems when they file for a patent for their infinite persistence gyroscope. Meanwhile, the girls give Raj dating advice when Emily reaches out to him after their breakup.

  211. How Many Episodes Of "The Big Bang Theory" Have You 206

    203.

    The Solder Excursion Diversion(2016)

    Amy is shocked at a revelation from Sheldon after she buys him a new laptop. Meanwhile, Raj sells out Leonard and Howard after they lie to their wives in order to attend an early screening of a movie.

  212. How Many Episodes Of "The Big Bang Theory" Have You 207

    204.

    The Big Bear Precipitation(2016)

    Secrets are revealed when Amy and Sheldon join Penny and Leonard on a weekend cabin trip. Raj is more excited about Howard’s and Bernadette’s impending parenthood than they are.

  213. How Many Episodes Of "The Big Bang Theory" Have You 208

    205.

    The Viewing Party Combustion(2016)

    The gang pick sides when a small argument between Leonard and Sheldon erupts into a heated fight during a “Game of Thrones” viewing party.

  214. How Many Episodes Of "The Big Bang Theory" Have You 209

    206.

    The Fermentation Bifurcation(2016)

    Sheldon and Bernadette spend the evening together while the rest of the gang go to a wine tasting party, but things get uncomfortable for Raj when Penny’s ex-boyfriend Zack shows up and takes an interest in Claire.

  215. How Many Episodes Of "The Big Bang Theory" Have You 210

    207.

    The Line Substitution Solution(2016)

    Sheldon hires Stuart to spend the day with Amy when he would rather go to the movies. Meanwhile, Penny struggles to make a connection with Leonard’s mother when she comes to visit.

  216. How Many Episodes Of "The Big Bang Theory" Have You 211

    208.

    The Convergence Convergence(2016)

    Leonard and Penny try to have a wedding ceremony that everyone can attend, but it creates serious conflict among Sheldon’s mother and Leonard’s divorced parents. Meanwhile, Howard and Raj become convinced the government is out to get them.

  217. Season 10

  218.  

    209.

    Recap(2017)

    A collection of some of last season’s hilarious and most memorable moments.

  219. How Many Episodes Of "The Big Bang Theory" Have You 212

    210.

    The Conjugal Conjecture(2016)

    As Leonard and Penny attempt to hold another wedding ceremony everyone can attend, they have to deal with Penny’s family arriving and Leonard’s father spending the night with Sheldon’s mother.

  220. How Many Episodes Of "The Big Bang Theory" Have You 213

    211.

    The Military Miniaturization(2016)

    Howard is visited by an Air Force colonel regarding his invention. Penny accidentally lets it slip about Bernadette’s pregnancy to their co-workers.

  221. How Many Episodes Of "The Big Bang Theory" Have You 214

    212.

    The Dependence Transcendence(2016)

    Bernadette confesses to Raj that she isn’t sure if she’s ready to be a mother, Penny accompanies Amy to a university mixer, and Sheldon goes to unusual extremes to assist Howard with his military project.

  222. How Many Episodes Of "The Big Bang Theory" Have You 215

    213.

    The Cohabitation Experimentation(2016)

    When Amy must vacate her apartment for repairs, living arrangements are made with Leonard, Sheldon, and Penny. Howard and Bernadette don’t want to know the sex of their baby, but Raj finds out.

  223. How Many Episodes Of "The Big Bang Theory" Have You 216

    214.

    The Hot Tub Contamination(2016)

    Sheldon and Amy go through a period of adjustment with their new living arrangement. Howard and Bernadette are forced to vacation at home when she falls ill and keep it a secret, unaware Raj and Stuart planned to use their hot tub.

  224. How Many Episodes Of "The Big Bang Theory" Have You 217

    215.

    The Fetal Kick Catalyst(2016)

    Sheldon and Amy host a brunch. Penny is surprised by her popularity when her movie, “Serial Ape-Ist” is featured at a Van Nuys comic book convention. Howard starts to freak out about parenthood after feeling the baby kick for the first time.

  225. How Many Episodes Of "The Big Bang Theory" Have You 218

    216.

    The Veracity Elasticity(2016)

    Amy doesn’t tell Sheldon her apartment has been repaired. Leonard finds out Penny is slowly moving all of his collectible toys into storage.

  226. How Many Episodes Of "The Big Bang Theory" Have You 219

    217.

    The Brain Bowl Incubation(2016)

    A successful gene experimentation leaves Sheldon excited to procreate with Amy, and he pulls out all stops to get her on board. Meanwhile, Raj takes an interest in the cleaning lady at the university.

  227. How Many Episodes Of "The Big Bang Theory" Have You 220

    218.

    The Geology Elevation(2016)

    Sheldon can’t contain his jealousy when Bert wins a grant for his geology research. A distasteful toy built by Howard faces judgement from the gang.

  228. How Many Episodes Of "The Big Bang Theory" Have You 221

    219.

    The Property Division Collision(2016)

    Dividing up their possessions becomes an all-out war between Leonard and Sheldon. Stuart asks to live with Howard and Bernadette and tries to supplant Raj’s efforts to help with the new baby.

  229. How Many Episodes Of "The Big Bang Theory" Have You 222

    220.

    The Birthday Synchronicity(2016)

    Amy’s desire to have an intimate night with Sheldon on her birthday is interrupted by Bernadette going into labor.

  230. How Many Episodes Of "The Big Bang Theory" Have You 223

    221.

    The Holiday Summation(2017)

    After spending the holidays apart, the gang get together to hear about Sheldon’s and Amy’s trip to Texas, Leonard’s and Penny’s Christmas tree adventure, and Howard’s and Bernadette’s first days as parents.

  231. How Many Episodes Of "The Big Bang Theory" Have You 224

    222.

    The Romance Recalibration(2017)

    Leonard and Penny ask for Sheldon’s and Amy’s help on putting the romance back in their marriage. Howard and Raj go to extreme lengths to stop the floor in Halley’s bedroom from making noise.

  232. How Many Episodes Of "The Big Bang Theory" Have You 225

    223.

    The Emotion Detection Automation(2017)

    Penny wants to help her brother get a job with her company. Sheldon learns of a machine that will help him understand human emotions. Raj reunites some of his old girlfriends to figure out why he is still single.

  233. How Many Episodes Of "The Big Bang Theory" Have You 226

    224.

    The Locomotion Reverberation(2017)

    Leonard and Howard’s attempt to keep Sheldon away from their Air Force project by sending him on a train trip backfires. Penny and Amy take Bernadette for her first night out since having the baby.

  234. How Many Episodes Of "The Big Bang Theory" Have You 227

    225.

    The Allowance Evaporation(2017)

    Sheldon and Amy have their first fight since moving in together. Meanwhile Raj is shocked at the reality of financial independence when he stops receiving support from his father.

  235. How Many Episodes Of "The Big Bang Theory" Have You 228

    226.

    The Comic-Con Conundrum(2017)

    The guys’ annual trip to Comic Con is in doubt when Raj can’t afford to go.

  236. How Many Episodes Of "The Big Bang Theory" Have You 229

    227.

    The Escape Hatch Identification(2017)

    When the gang offer places for Raj to live, it creates unexpected conflict among everyone.

  237. How Many Episodes Of "The Big Bang Theory" Have You 230

    228.

    The Collaboration Fluctuation(2017)

    Leonard, Penny and Raj adjust to their new living arrangements; Sheldon expresses an interest in Amy’s work.

  238. How Many Episodes Of "The Big Bang Theory" Have You 231

    229.

    The Recollection Dissipation(2017)

    Sheldon reaches his limit when he works on projects with Leonard, Howard and Amy in one day. Bernadette has doubts about leaving Halley when she goes back to work.

  239. How Many Episodes Of "The Big Bang Theory" Have You 232

    230.

    The Separation Agitation(2017)

    Howard and Bernadette have a hard time leaving Halley in daycare when Bernadette returns to work. Bert introduces the gang to his new girlfriend.

  240. How Many Episodes Of "The Big Bang Theory" Have You 233

    231.

    The Cognition Regeneration(2017)

    Leonard is less than thrilled when Penny considers accepting a job offer from her ex-boyfriend, Zack. Sheldon worries that he hasn’t reached his full potential soon enough.

  241. How Many Episodes Of "The Big Bang Theory" Have You 234

    232.

    The Gyroscopic Collapse(2017)

    After celebrating the completion of the top-secret Air Force project, Leonard, Sheldon and Howard get an unwelcome surprise; Amy receives an offer for a summer position at Princeton as a visiting researcher.

  242. How Many Episodes Of "The Big Bang Theory" Have You 235

    233.

    The Long Distance Dissonance(2017)

    The gang become concerned when Sheldon’s former admirer, Ramona Nowitzki, resurfaces while Amy is away at Princeton.

  243. Season 11

  244. How Many Episodes Of "The Big Bang Theory" Have You 236

    234.

    The Proposal Proposal(2017)

    Amy has trouble deciding whether or not she should marry Sheldon. Meanwhile, Bernadette confides in Penny when she finds out some huge news.

  245. How Many Episodes Of "The Big Bang Theory" Have You 237

    235.

    The Retraction Reaction(2017)

    Leonard angers the University and the Physics Community when he gives an embarrassing radio interview. Bernadette and Amy compare their successes at work.

  246. How Many Episodes Of "The Big Bang Theory" Have You 238

    236.

    The Relaxation Integration(2017)

    Sheldon and Amy struggle with picking a wedding date. Meanwhile, Stuart and Raj fight over one of Bernadette’s co-workers for a date.

  247. How Many Episodes Of "The Big Bang Theory" Have You 239

    237.

    The Explosion Implosion(2017)

    Howard and Bernadette are disappointed when they find out the sex of the baby. Leonard is annoyed when his mother befriends Penny.

  248. How Many Episodes Of "The Big Bang Theory" Have You 240

    238.

    The Collaboration Contamination(2017)

    Amy and Howard work in the lab together causing Sheldon, Bernadette and Raj to feel jealous and lonely. Penny starts using a parenting book to control Sheldon’s behavior.

  249. How Many Episodes Of "The Big Bang Theory" Have You 241

    239.

    The Proton Regeneration(2017)

    Sheldon and Wil Wheaton both go head-to-head for the role of the new Professor Proton, Meanwhile Penny takes care of Halley when Bernadette and Howard are on bed rest.

  250. How Many Episodes Of "The Big Bang Theory" Have You 242

    240.

    The Geology Methodology(2017)

    When Bert asks Sheldon to collaborate on a project with him, Sheldon becomes worried about others finding out because he thinks geology is beneath him. Raj seeks advice after reconnecting with Ruchi.

  251. How Many Episodes Of "The Big Bang Theory" Have You 243

    241.

    The Tesla Recoil(2017)

    Howard and Leonard become upset after they discover that Sheldon has been working with the military without telling them; Bernadette asks Raj to investigate her suspicions that Ruchi is attempting to take her job away from her.

  252. How Many Episodes Of "The Big Bang Theory" Have You 244

    242.

    The Bitcoin Entanglement(2017)

    Sheldon tries to teach the other guys a lesson after they cut him out of a potentially valuable Bitcoin investment seven years ago.

  253. How Many Episodes Of "The Big Bang Theory" Have You 245

    243.

    The Confidence Erosion(2017)

    Sheldon and Amy try to eliminate stress from wedding planning by applying math to the process. Raj and Howard come to blows when Raj begins to feel like Howard hurts his confidence.

  254. How Many Episodes Of "The Big Bang Theory" Have You 246

    244.

    The Celebration Reverberation(2017)

    Raj and Howard’s feud continues as the gang plan Halley’s first birthday party. Sheldon’s surprise for Amy’s birthday goes awry when they get food poisoning.

  255. How Many Episodes Of "The Big Bang Theory" Have You 247

    245.

    The Matrimonial Metric(2018)

    Sheldon and Amy pick their best-man and maid of honor by experimenting on the gang. Meanwhile, Leonard’s self-confidence is still badly damaged after reading his brother’s Christmas letter.

  256. How Many Episodes Of "The Big Bang Theory" Have You 248

    246.

    The Solo Oscillation(2018)

    Sheldon kicks Amy out of the apartment to work solo, and she and Leonard end up bonding during a series of science experiments; Howard is replaced by Bert in Footprints on the Moon.

  257. How Many Episodes Of "The Big Bang Theory" Have You 249

    247.

    The Separation Triangulation(2018)

    Raj meets a girl at the Planetarium, but soon after finds out she is married. Sheldon rents out his old room to use for his work.

  258. How Many Episodes Of "The Big Bang Theory" Have You 250

    248.

    The Novelization Correlation(2018)

    Leonard’s book raises questions, and Amy guest stars on the new Professor Proton show.

  259. How Many Episodes Of "The Big Bang Theory" Have You 251

    249.

    The Neonatal Nomenclature(2018)

    When Bernadette won’t go into labor, the gang try different tactics to get things started. Also, Wolowitz confronts Bernadette after Amy accidentally reveals she’s already chosen their son’s name.

  260. How Many Episodes Of "The Big Bang Theory" Have You 252

    250.

    The Athenaeum Allocation(2018)

    Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy. Also, Bernadette and Wolowitz have a hard time deciding who should stay at home with the kids and who should go back to work.

  261. How Many Episodes Of "The Big Bang Theory" Have You 253

    251.

    The Gates Excitation(2018)

    Leonard, Howard and Raj try to meet Bill Gates, who’s meeting with Penny to merge their companies; Sheldon thinks he’s the victim of an April Fool’s prank.

  262. How Many Episodes Of "The Big Bang Theory" Have You 254

    252.

    The Tenant Disassociation(2018)

    Leonard runs against Sheldon to be president of the tenants association; Wolowitz and Koothrappali find a drone in the backyard.

  263. How Many Episodes Of "The Big Bang Theory" Have You 255

    253.

    The Reclusive Potential(2018)

    Sheldon takes the guys to a cabin in the middle of nowhere to meet a reclusive scientist; Penny and Bernadette improvise Amy’s bachelorette party.

  264. How Many Episodes Of "The Big Bang Theory" Have You 256

    254.

    The Comet Polarization(2018)

    Sheldon’s comic book store experience changes when writer Neil Gaiman puts Stuart’s store on the map; friendships are threatened when Koothrappali takes credit for Penny’s astronomical discovery.

  265. How Many Episodes Of "The Big Bang Theory" Have You 257

    255.

    The Monetary Insufficiency(2018)

    Sheldon goes to Vegas to win money for science. Also, Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies.

  266. How Many Episodes Of "The Big Bang Theory" Have You 258

    256.

    The Sibling Realignment(2018)

    Sheldon and Leonard make a road trip to wrangle a reluctant wedding guest.

  267. How Many Episodes Of "The Big Bang Theory" Have You 259

    257.

    The Bow Tie Asymmetry(2018)

    When Amy’s parents and Sheldon’s family arrive, everybody is focused to make sure all wedding arrangements go according to plan – everyone except the bride and groom.

  268. Season 12

  269. How Many Episodes Of "The Big Bang Theory" Have You 260
  270. How Many Episodes Of "The Big Bang Theory" Have You 261
  271. How Many Episodes Of "The Big Bang Theory" Have You 262

    260.

    The Procreation Calculation(2018)

    The Wolowitzes’ life gets complicated when Stuart starts bringing his new girlfriend home. Also, Penny and Leonard talk about starting a family while Koothrappali explores an arranged marriage.

  272. How Many Episodes Of "The Big Bang Theory" Have You 263

    261.

    The Tam Turbulence(2018)

    Sheldon won’t tell anyone why he’s never mentioned Tam, his childhood best friend, so Leonard takes matters into his own hands. Also, Bernadette and Penny take out Raj’s fiancée, Anu, for dinner to get the skinny on her.

  273. How Many Episodes Of "The Big Bang Theory" Have You 264

    262.

    The Planetarium Collision(2018)

    Amy doesn’t have time to work with Sheldon on super asymmetry, so he goes to great lengths to ensure she’s available. Koothrappali doesn’t want Wolowitz to join him in hosting a show at the planetarium.

  274. How Many Episodes Of "The Big Bang Theory" Have You 265

    263.

    The Imitation Perturbation(2018)

    When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny’s Halloween party. Also, Leonard is shocked that Penny doesn’t remember their first kiss.

  275. How Many Episodes Of "The Big Bang Theory" Have You 266

    264.

    The Grant Allocation Derivation(2018)

    Leonard is caught between a rock and a hard place when he’s responsible for distributing extra grant money. Also, Bernadette turns the backyard playhouse into a hideaway from her husband and kids.

  276. How Many Episodes Of "The Big Bang Theory" Have You 267

    265.

    The Consummation Deviation(2018)

    Sheldon tries to bond with Amy’s father, but when Wolowitz lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Also, Koothrappali and Anu try to get physical for the first time.

  277. How Many Episodes Of "The Big Bang Theory" Have You 268

    266.

    The Citation Negation(2018)

    Sheldon and Amy are devastated after learning from a Russian paper that super asymmetry has already been theorized and disproved. Bernadette wants to beat Howard in a popular video game.

  278. How Many Episodes Of "The Big Bang Theory" Have You 269

    267.

    The VCR Illumination(2018)

    A VHS tape from Sheldon’s past inspires him and Amy not to give up when they’re still feeling down about their theory being disproven. Bernadette turns into a pageant mom when she tries to help Howard with his Magic Castle audition.

  279. How Many Episodes Of "The Big Bang Theory" Have You 270

    268.

    The Paintball Scattering(2019)

    Penny and Leonard organize a paintball game, which results in mayhem when Sheldon becomes jealous of Amy. Raj catches Anu with her ex-boyfriend. Stuart doesn’t want to move in with Denise.

  280. How Many Episodes Of "The Big Bang Theory" Have You 271

    269.

    The Propagation Proposition(2019)

    Penny’s ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.

  281. How Many Episodes Of "The Big Bang Theory" Have You 272

    270.

    The Confirmation Polarization(2019)

    Sheldon and Amy are thrilled when their super asymmetry theory is proven by two physicists, until they try to kick Amy off the Nobel nomination. Bernadette gets one of her drugs approved and wants a reluctant Penny to head the sales team.

  282. How Many Episodes Of "The Big Bang Theory" Have You 273

    271.

    The Meteorite Manifestation(2019)

    Sheldon is thrilled to help Bernadette and Howard navigate bureaucracy concerning a neighbor’s non-compliant balcony until he learns they too have ignored codes. Leonard is disappointed when his friends are uninterested in his new laser.

  283. How Many Episodes Of "The Big Bang Theory" Have You 274

    272.

    The Donation Oscillation(2019)

    Penny tries to throw a wrench into Leonard’s plan to be a sperm donor for her ex-boyfriend; Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali’s canceled bachelor party into a couple’s trip aboard the “vomit comet.”

  284. How Many Episodes Of "The Big Bang Theory" Have You 275

    273.

    The D & D Vortex(2019)

    The gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game involving William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith. Deception and betrayal are the path to make it to the one open seat.

  285. How Many Episodes Of "The Big Bang Theory" Have You 276

    274.

    The Conference Valuation(2019)

    Bernadette and Penny travel to San Diego for a pharmaceutical sales convention. Back home, Amy and the guys experiment on the Wolowitz children when Sheldon finds a book on it.

  286. How Many Episodes Of "The Big Bang Theory" Have You 277

    275.

    The Laureate Accumulation(2019)

    Rivals Pemberton and Campbell charm America on a publicity tour so Sheldon and Amy try to win over Nobel laureates Kip Thorne, George Smoot and Frances Arnold. Halley’s fear of the dark causes opportunity and conflict at the Wolowitz home.

  287. How Many Episodes Of "The Big Bang Theory" Have You 278

    276.

    The Inspiration Deprivation(2019)

    Contemplating what it would mean to all women if she were to win a Nobel Prize causes Amy to have a meltdown. Koothrappali and Wolowitz try to relive the good old days after Wolowitz buys a scooter that looks like the one he had years ago.

  288. How Many Episodes Of "The Big Bang Theory" Have You 279

    277.

    The Decision Reverberation(2019)

    Koothrappali is worried people won’t take him seriously in his own field after publishing a paper that suggests he may have discovered alien life. Leonard wants to be the principal investigator on a plasma physics study.

  289. How Many Episodes Of "The Big Bang Theory" Have You 280

    278.

    The Plagiarism Schism(2019)

    Kripke has proof that Dr. Pemberton plagiarized his thesis in college, and Sheldon and Amy aren’t sure if they should turn him in. Wolowitz learns that Bernadette wasn’t the only waitress at the Cheesecake Factory who had a crush on him.

  290. How Many Episodes Of "The Big Bang Theory" Have You 281

    279.

    The Maternal Conclusion(2019)

    Leonard is pleasantly surprised when Beverly comes to visit and she’s genuinely kind to him, until he finds out the real reason she’s there. Also, Denise and Stuart overstay their welcome at the Wolowitz house.

  291. How Many Episodes Of "The Big Bang Theory" Have You 282
  292. How Many Episodes Of "The Big Bang Theory" Have You 283

    281.

    The Stockholm Syndrome(2019)

    Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; and Koothrappali makes a new friend, as the gang travels together into an uncharted future.

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