Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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see all options Availability data: JustWatch
- Seasons
- 12
- Episodes aired
- 279
- Latest aired
- S12E23
- Total runtime
- 3d 22h
Timeline when each season aired
- Season 1 September 2007 – May 2008 17 episodes
- Season 2 September 2008 – May 2009 23 episodes
- Season 3 September 2009 – May 2010 23 episodes
- Season 4 September 2010 – May 2011 24 episodes
- Season 5 September 2011 – May 2012 24 episodes
- Season 6 September 2012 – May 2013 24 episodes
- Season 7 September 2013 – May 2014 24 episodes
- Season 8 September 2014 – May 2015 24 episodes
- Season 9 September 2015 – May 2016 24 episodes
- Season 10 September 2016 – May 2017 24 episodes
- Season 11 September 2017 – May 2018 24 episodes
- Season 12 September 2018 – May 2019 24 episodes
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S10E01 The Conjugal Conjecture
September 19 · 22min find the promo
Show synopsis
After Sheldon’s mother and Leonard's father share an evening together, everyone deals with an awkward morning the next day. Also, Penny’s family arrives for the wedding ceremony, including her anxiety-ridden mother, Susan, and her drug dealing brother, Randall.
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S10E02 The Military Miniaturization
September 26 · 19min find the promo
Show synopsis
Colonel Williams, an Air Force representative from the Department of Material Command sits down to talk with Wolowitz.
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S10E03 The Dependence Transcendence
October 3 · 20min find the promo
Show synopsis
Tensions rise when the boys struggle to complete their government project on time and Sheldon tries an energy drink to stay awake. Also, Penny and Amy go to a “party” at Bert the geologist’s house, and Koothrappali learns Bernadette’s true feelings about her pregnancy when they clean out the future baby room.
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S10E04 The Cohabitation Experimentation
October 10 · 20min find the promo
Show synopsis
When Amy’s apartment floods, she proposes a “cohabitation experiment” with Sheldon. Also, Howard and Bernadette are upset when Koothrappali learns the gender of the baby before they do.
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S10E05 The Hot Tub Contamination
October 17 · 20min find the promo
Show synopsis
Leonard and Penny must separate a quarreling Sheldon and Amy when their cohabitation does not go as planned, and Sheldon threatens to break off their relationship when Amy refuses to adhere to the bathroom schedule. Also, Howard and Bernadette find unexpected guests at their house when they decide to stay home from a planned vacation.
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S10E06 The Fetal Kick Catalyst
October 27 · 18min find the promo
Show synopsis
Penny is surprised to learn she has fans of her performance in "Serial Ape-ist" when she attends Van Nuys Comic Con with Leonard. Also, Amy hosts a Sheldon-style brunch at Penny’s apartment, and Wolowitz makes an impulsive purchase when he starts stressing out about the baby on the way.
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S10E07 The Veracity Elasticity
November 3 · 21min find the promo
Show synopsis
In order to continue living with Sheldon, Amy lies to him about repairs being made to her apartment and they host an "on location" episode of "Fun With Flags" in Penny’s apartment. Also, Leonard lets Penny decorate Sheldon’s old room after he learns that she has been secretly moving Leonard’s collectibles into storage.
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S10E08 The Brain Bowl Incubation
November 10 · 19min find the promo
Show synopsis
After a successful experiment combining their genes, Sheldon will stop at nothing to convince Amy they should procreate. Also, Koothrappali is embarrassed to tell the gang what the new woman he’s dating does for a living.
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S10E09 The Geology Elevation
November 17 · 19min find the promo
Show synopsis
When Bert, a Caltech geologist, wins the MacArthur Genius fellowship, Sheldon is overcome with jealousy. Also, Wolowitz finds an old remote control Stephen Hawking action figure he invented.
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S10E10 The Property Division Collision
December 1 · 20min find the promo
Show synopsis
Sheldon and Leonard try to divvy up their shared belongings, but can’t agree on anything. Also, Koothrappali and Stuart fight to be the most helpful during Bernadette’s final weeks of pregnancy.
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S10E11 The Birthday Synchronicity
December 15 · 20min find the promo
Show synopsis
Howard and Bernadette welcome their new baby and Sheldon and Amy celebrate Amy’s birthday.
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S10E12 The Holiday Summation
January 5 · 21min find the promo
Show synopsis
Sheldon and Amy visit Leonard and Penny for the first time since the holidays and share details about their terrible trip to Texas.
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S10E13 The Romance Recalibration
January 19 · 19min find the promo
Show synopsis
When Penny feels that Leonard is taking her for granted, she decides to go on a spa weekend with Amy. Also, Wolowitz and Koothrappali try to fix a squeaky floorboard in the baby’s room.
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S10E14 The Emotion Detection Automation
February 2 · 19min find the promo
Show synopsis
Sheldon beta-tests an MIT invention after hearing it can help him read people’s emotions. Also, Leonard can’t hide his feelings when Penny announces her brother is coming to town, and Raj invites his ex-girlfriends over to give him dating advice.
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S10E15 The Locomotion Reverberation
February 9 · 20min find the promo
Show synopsis
Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette out for the night, leaving Raj and Stuart to care for baby Halley.
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S10E16 The Allowance Evaporation
February 16 · 18min find the promo
Show synopsis
Sheldon and Amy have their first fight since moving in together, and Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.
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S10E17 The Comic-Con Conundrum
February 23 · 19min find the promo
Show synopsis
With Koothrappali cut off from his father’s fortune, he appoints Sheldon to help him get out of debt. Also, Penny considers joining Leonard at Comic-Con.
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S10E18 The Escape Hatch Identification
March 9 · 20min find the promo
Show synopsis
When Raj moves out of his apartment, Leonard and Penny offer him Sheldon's old room.
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S10E19 The Collaboration Fluctuation
March 30 · 18min find the promo
Show synopsis
Leonard, Penny and Raj adjust to their new living arrangement, and Sheldon takes an interest in Amy’s work.
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S10E20 The Recollection Dissipation
April 6 · 19min find the promo
Show synopsis
Sheldon pushes himself to the limit when he collaborates on projects with Leonard and Wolowitz as well as Amy on the same day. Also, Bernadette is nearing the end of her maternity leave and must return to work.
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S10E21 The Separation Agitation
April 13 · 20min find the promo
Show synopsis
Howard and Bernadette have a hard time leaving Halley in day care when Bernadette returns to work. Also, Bert introduces the gang to his new girlfriend, Rebecca.
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S10E22 The Cognition Regeneration
April 27 · 20min find the promo
Show synopsis
Leonard isn’t thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack.
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S10E23 The Gyroscopic Collapse
May 4 · 19min find the promo
Show synopsis
After Leonard, Sheldon and Wolowitz celebrate the completion of the top secret air force project, they are met with an unpleasant surprise. Also, Amy is offered a summer position as a visiting researcher.
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S10E24 The Long Distance Dissonance
May 11 · 19min find the promo
Show synopsis
The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.