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The Best Episodes of The Big Bang Theory Season 12

Every episode of The Big Bang Theory Season 12 ranked from best to worst. Discover the Best Episodes of The Big Bang Theory Season 12!

Binge this in 8h 36m•Peaking at 9.9/10

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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Episode Rankings

  1. #1 Fan Favorite
    The Big Bang Theory Season 12 Episode 1 - The Conjugal Configuration
    9.9/10(1202 votes)

    #1 - The Conjugal Configuration

    S12:E1

    Sheldon and Amy's honeymoon runs aground in New York. Penny and Leonard discover they are uncomfortably similar to Amy's parents. Raj insults physicist Neil deGrasse Tyson and starts a Twitter war.

    Director:Mark Cendrowski
    Writer:Unknown

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  2. The Big Bang Theory Season 12 Episode 2 - The Wedding Gift Wormhole
    7.4/10(42 votes)

    #2 - The Wedding Gift Wormhole

    S12:E2

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

    Director:Mark Cendrowski
    Writer:Unknown

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  3. The Big Bang Theory Season 12 Episode 3 - The Procreation Calculation
    7.0/10(41 votes)

    #3 - The Procreation Calculation

    S12:E3

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

    Director:Mark Cendrowski
    Writer:Unknown

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  4. The Big Bang Theory Season 12 Episode 4 - The Tam Turbulence
    6.9/10(41 votes)

    #4 - The Tam Turbulence

    S12:E4

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

    Director:Mark Cendrowski
    Writer:Unknown

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  5. The Big Bang Theory Season 12 Episode 5 - The Planetarium Collision
    6.7/10(39 votes)

    #5 - The Planetarium Collision

    S12:E5

    When Amy doesn’t have time to work on super-asymmetry, 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. Raj doesn’t want Howard to join him in hosting a show at the planetarium.

    Director:Mark Cendrowski
    Writer:Unknown

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  6. The Big Bang Theory Season 12 Episode 6 - The Imitation Perturbation
    7.5/10(42 votes)

    #6 - The Imitation Perturbation

    S12:E6

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

    Director:Mark Cendrowski
    Writer:Unknown

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  7. The Big Bang Theory Season 12 Episode 7 - The Grant Allocation Derivation
    7.0/10(42 votes)

    #7 - The Grant Allocation Derivation

    S12:E7

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

    Director:Mark Cendrowski
    Writer:Unknown

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  8. The Big Bang Theory Season 12 Episode 8 - The Consummation Deviation
    7.0/10(41 votes)

    #8 - The Consummation Deviation

    S12:E8

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

    Director:Mark Cendrowski
    Writer:Unknown

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  9. The Big Bang Theory Season 12 Episode 9 - The Citation Negation
    7.0/10(39 votes)

    #9 - The Citation Negation

    S12:E9

    Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been theorized and disproven. Meanwhile, ultra-competitive Bernadette asks Stuart’s girlfriend to teach her how to beat Howard in a popular video game.

    Director:Kristy Cecil
    Writer:Unknown

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  10. The Big Bang Theory Season 12 Episode 10 - The VCR Illumination
    7.0/10(41 votes)

    #10 - The VCR Illumination

    S12:E10

    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. Bernadette turns into a pageant mom when she tries to help Howard ace his Magic Castle audition.

    Director:Mark Cendrowski
    Writer:Unknown

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  11. The Big Bang Theory Season 12 Episode 11 - The Paintball Scattering
    7.0/10(40 votes)

    #11 - The Paintball Scattering

    S12:E11

    Penny and Leonard organize a paintball game that results in mayhem when Sheldon is jealous of Amy. Also, Raj catches Anu with her ex-boyfriend, and Stuart gets cold feet when Denise hints at the possibility of them living together.

    Director:Mark Cendrowski
    Writer:Unknown

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  12. The Big Bang Theory Season 12 Episode 12 - The Propagation Proposition
    6.7/10(38 votes)

    #12 - The Propagation Proposition

    S12:E12

    Penny runs into her ex-boyfriend, Zack, who invites her and Leonard to a dinner to meet his newlywed wife. After the dinner the newlywed couple make an odd proposition to Leonard, which makes Penny to freak out. Also, Raj attempts to mend things with his ex-fiancée, Anu.

    Director:Mark Cendrowski
    Writer:Unknown

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  13. The Big Bang Theory Season 12 Episode 13 - The Confirmation Polarization
    6.7/10(36 votes)

    #13 - The Confirmation Polarization

    S12:E13

    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. Also, Bernadette gets one of her drugs approved at work and wants a reluctant Penny to head the sales team.

    Director:Mark Cendrowski
    Writer:Unknown

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  14. The Big Bang Theory Season 12 Episode 14 - The Meteorite Manifestation
    6.7/10(38 votes)

    #14 - The Meteorite Manifestation

    S12:E14

    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.

    Director:Mark Cendrowski
    Writer:Unknown

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  15. The Big Bang Theory Season 12 Episode 15 - The Donation Oscillation
    6.8/10(40 votes)

    #15 - The Donation Oscillation

    S12:E15

    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.

    Director:Mark Cendrowski
    Writer:Unknown

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  16. The Big Bang Theory Season 12 Episode 16 - The D & D Vortex
    7.3/10(42 votes)

    #16 - The D & D Vortex

    S12:E16

    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.

    Director:Mark Cendrowski
    Writer:Unknown

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  17. The Big Bang Theory Season 12 Episode 17 - The Conference Valuation
    6.6/10(39 votes)

    #17 - The Conference Valuation

    S12:E17

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

    Director:Mark Cendrowski
    Writer:Unknown

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  18. The Big Bang Theory Season 12 Episode 18 - The Laureate Accumulation
    6.9/10(36 votes)

    #18 - The Laureate Accumulation

    S12:E18

    When competitors Pemberton and Campbell charm America on a publicity tour, 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 causes opportunity and conflict at the Wolowitz home.

    Director:Mark Cendrowski
    Writer:Unknown

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  19. The Big Bang Theory Season 12 Episode 19 - The Inspiration Deprivation
    6.5/10(33 votes)

    #19 - The Inspiration Deprivation

    S12:E19

    The concept of what it would mean for women everywhere if Amy were to win a Nobel Prize causes Amy to have a meltdown. Also, Howard and Raj try to relive the good old days after Howard buys a scooter that looks like the one he had years ago.

    Director:Mark Cendrowski
    Writer:Unknown

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  20. The Big Bang Theory Season 12 Episode 20 - The Decision Reverberation
    6.6/10(38 votes)

    #20 - The Decision Reverberation

    S12:E20

    Raj 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  21. The Big Bang Theory Season 12 Episode 21 - The Plagiarism Schism
    6.9/10(35 votes)

    #21 - The Plagiarism Schism

    S12:E21

    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. Meanwhile, Howard learns that Bernadette wasn't the only waitress at the Cheesecake Factory who had a crush on him.

    Director:Nikki Lorre
    Writer:Unknown

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  22. The Big Bang Theory Season 12 Episode 22 - The Maternal Conclusion
    7.3/10(35 votes)

    #22 - The Maternal Conclusion

    S12:E22

    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.

    Director:Kristy Cecil
    Writer:Unknown

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  23. The Big Bang Theory Season 12 Episode 23 - The Change Constant / The Stockholm Syndrome
    8.0/10(43 votes)

    #23 - The Change Constant / The Stockholm Syndrome

    S12:E23

    Sheldon and Amy await big news. Meanwhile, Penny and Leonard have some big news of their own. Also, Howard and Bernadette face the stressful challenge of leaving their kids for the first time and Raj makes a new friend, as the gang travels together into an uncharted future.

    Director:Mark Cendrowski
    Writer:Unknown

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  24. The Big Bang Theory Season 12 Episode 24 - Unraveling the Mystery: A Big Bang Farewell
    8.2/10(25 votes)

    #24 - Unraveling the Mystery: A Big Bang Farewell

    S12:E24

    Johnny Galecki and Kaley Cuoco will lead fans on a trip down memory lane, sharing some of the best-kept backstage secrets and personal memories from the past 12 years.

    Director:Unknown
    Writer:Unknown

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Season 12 Ratings Summary

"The Conjugal Configuration" is the best rated episode of "The Big Bang Theory" season 12. It scored 9.9/10 based on 1202 votes. Directed by Mark Cendrowski and written by Unknown, it aired on 9/24/2018. This episode is rated 2.5 points higher than the second-best, "The Wedding Gift Wormhole".