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The Big Bang Theory Season 12 Episodes

24 Episodes 2018 - 2019

Season 12 of the comedy series brings some closure to the gang as they all move forward with their lives. Sheldon (Jim Parsons) and Amy (Mayim Bialik) struggle to adjust to married life, especially when Sheldon refuses any change; Leonard (Johnny Galecki) and Penny (Kaley Cuoco) discuss having children, and discover they have very different opinions on the matter; Raj (Kunal Nayyar), feeling left out as he's the only one of the group not in a relationship, asks his father to arrange a marriage; Howard (Simon Helberg) and Bernadette (Melissa Rauch), seemingly the only ones who have already figured out their lives, try to be there for their friends in their times of need.

Episode 1

The Conjugal Configuration

Mon, Sep 24, 2018 30 mins

In the Season 12 premiere, Sheldon and Amy's honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy's parents, Mr. and Mrs. Fowler. Also, Koothrappali insults physicist Neil deGrasse Tyson and starts a Twitter war.

Where to Watch
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Episode 2

The Wedding Gift Wormhole

Thu, Sep 27, 2018 30 mins

Sheldon and Amy drive themselves crazy trying to figure out what "perfect gift" Leonard and Penny gave them for their wedding. Also, Koothrappali decides he wants to settle down and asks his father to arrange a marriage for him.

Where to Watch
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Episode 3

The Procreation Calculation

Thu, Oct 4, 2018 22 mins

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.

Where to Watch
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Episode 4

The Tam Turbulence

Thu, Oct 11, 2018 30 mins

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.

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Episode 5

The Planetarium Collision

Thu, Oct 18, 2018 22 mins

Amy doesn't have time to work on super-asymmetry, so Sheldon goes to great lengths to ensure she's available to work with him even it if means accidentally sabotaging her career in the process. Also, Koothrappali doesn't want Wolowitz to join him in hosting a show at the planetarium.

Where to Watch
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Episode 6

The Imitation Perturbation

Thu, Oct 25, 2018 22 mins

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.

Where to Watch
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Episode 7

The Grant Allocation Derivation

Thu, Nov 1, 2018 22 mins

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.

Where to Watch
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Episode 8

The Consummation Deviation

Thu, Nov 8, 2018 22 mins

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.

Where to Watch
The Big Bang Theory, Season 12 Episode 8 image

Episode 9

The Citation Negation

Thu, Nov 15, 2018 31 mins

Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been discovered and disproven. Also, ultra-competitive Bernadette asks Stuart's girlfriend, Denise, to teach her how to beat Howard in a popular videogame.

Where to Watch
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Episode 10

The VCR Illumination

Thu, Dec 6, 2018 31 mins

Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon's past inspires him not to give up. Also, Bernadette turns into a pageant mom when she tries to help Wolowitz ace his Magic Castle audition.

Where to Watch
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Episode 11

The Paintball Scattering

Thu, Jan 3, 2019 22 mins

Penny and Leonard organize a paintball game that results in mayhem when Sheldon is jealous of Amy. Also, Koothrappali catches Anu with her ex-boyfriend, and Stuart doesn't want to move in with Denise.

Where to Watch
The Big Bang Theory, Season 12 Episode 11 image

Episode 12

The Propagation Proposition

Thu, Jan 10, 2019 22 mins

Penny's ex-boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard for help. Also, Koothrappali attempts to mend things with his ex-fiancée, Anu.

Where to Watch
The Big Bang Theory, Season 12 Episode 12 image

Episode 13

The Confirmation Polarization

Thu, Jan 17, 2019 22 mins

Sheldon and Amy's super asymmetry theory is proven by two physicists, Dr. Pemberton and Dr. Campbell from Chicago, who then try to kick Amy off the Nobel nomination. Also, Bernadette has a big success at work and Penny's going to be a part of it—whether she wants to or not.

Where to Watch
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Episode 14

The Meteorite Manifestation

Thu, Jan 31, 2019 22 mins

Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law. Also, Leonard is disappointed when his friends exclude him from a scientific project.

Where to Watch
The Big Bang Theory, Season 12 Episode 14 image

Episode 15

The Donation Oscillation

Thu, Feb 7, 2019 30 mins

Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa. Also, Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip aboard the "vomit comet."

Where to Watch
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Episode 16

The D & D Vortex

Thu, Feb 21, 2019 30 mins

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.

Where to Watch
The Big Bang Theory, Season 12 Episode 16 image

Episode 17

The Conference Valuation

Thu, Mar 7, 2019 22 mins

Penny and Bernadette go to San Diego for a pharmaceutical sales convention, leaving Wolowitz in charge of the kids. Also, Sheldon finds a book on experimenting on kids, and the guys plus Amy make a day of it.

Where to Watch
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Episode 18

The Laureate Accumulation

Thu, Apr 4, 2019 25 mins

Competitors Pemberton and Campbell charm America on a publicity tour, so Sheldon and Amy try to bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side. Also, Halley's fear of the dark leads to opportunity and conflict for Howard, Bernadette and Stuart.

Where to Watch
The Big Bang Theory, Season 12 Episode 18 image

Episode 19

The Inspiration Deprivation

Thu, Apr 18, 2019 22 mins

Amy has a meltdown due to the pressure associated with winning a Nobel Prize. Also, Koothrappali and Wolowitz try to relive the good old days after Wolowitz buys a scooter that looks like the one he had years ago.

Where to Watch
The Big Bang Theory, Season 12 Episode 19 image

Episode 20

The Decision Reverberation

Thu, Apr 25, 2019 22 mins

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. Also, Leonard wants to be the principal investigator on a plasma physics study.

Where to Watch
The Big Bang Theory, Season 12 Episode 20 image

Episode 21

The Plagiarism Schism

Thu, May 2, 2019 22 mins

Kripke has proof that Dr. Pemberton plagiarized his thesis in college, and Sheldon and Amy aren't sure if they should turn him in or not. Also, Wolowitz is happily surprised to learn that Bernadette wasn't the only waitress at the Cheesecake Factory who had a crush on him back in the day.

Where to Watch
The Big Bang Theory, Season 12 Episode 21 image

Episode 22

The Maternal Conclusion

Thu, May 9, 2019 22 mins

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.

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Episode 23

The Change Constant

Thu, May 16, 2019 30 mins

Amy and Sheldon wait for the news. Wolowitz and Bernadette leave their kids. Leonard and Penny keep a secret.

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The Big Bang Theory, Season 12 Episode 23 image

Episode 24

The Stockholm Syndrome

Thu, May 16, 2019 22 mins

In the series finale, 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.

Where to Watch
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