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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 37m•Peaking at 9.5/10

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 24 - Unraveling the Mystery: A Big Bang Farewell
    9.5/10(12328 votes)

    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:Chuck Lorre

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  2. The Big Bang Theory Season 12 Episode 23 - The Change Constant / The Stockholm Syndrome
    9.0/10(5980 votes)

    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
    Writers:Chuck Lorre, Eric Kaplan, Bill Prady, David Goetsch, Steven Molaro, Steve Holland, Maria Ferrari, Andy Gordon, Anthony Del Broccolo, Tara Hernandez, Jeremy Howe, Adam Faberman

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  3. The Big Bang Theory Season 12 Episode 6 - The Imitation Perturbation
    8.2/10(3708 votes)

    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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  4. The Big Bang Theory Season 12 Episode 1 - The Conjugal Configuration
    8.0/10(4752 votes)

    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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  5. The Big Bang Theory Season 12 Episode 16 - The D & D Vortex
    8.0/10(3341 votes)

    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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  6. The Big Bang Theory Season 12 Episode 22 - The Maternal Conclusion
    7.9/10(3578 votes)

    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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  7. The Big Bang Theory Season 12 Episode 2 - The Wedding Gift Wormhole
    7.6/10(3303 votes)

    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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  8. The Big Bang Theory Season 12 Episode 10 - The VCR Illumination
    7.5/10(3181 votes)

    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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  9. The Big Bang Theory Season 12 Episode 15 - The Donation Oscillation
    7.4/10(3026 votes)

    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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  10. The Big Bang Theory Season 12 Episode 7 - The Grant Allocation Derivation
    7.3/10(3023 votes)

    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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  11. The Big Bang Theory Season 12 Episode 8 - The Consummation Deviation
    7.3/10(3094 votes)

    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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  12. The Big Bang Theory Season 12 Episode 11 - The Paintball Scattering
    7.3/10(3001 votes)

    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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  13. The Big Bang Theory Season 12 Episode 21 - The Plagiarism Schism
    7.3/10(2986 votes)

    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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  14. The Big Bang Theory Season 12 Episode 3 - The Procreation Calculation
    7.2/10(3161 votes)

    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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  15. The Big Bang Theory Season 12 Episode 9 - The Citation Negation
    7.2/10(3045 votes)

    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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  16. The Big Bang Theory Season 12 Episode 12 - The Propagation Proposition
    7.1/10(2940 votes)

    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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  17. The Big Bang Theory Season 12 Episode 13 - The Confirmation Polarization
    7.1/10(2960 votes)

    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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  18. The Big Bang Theory Season 12 Episode 14 - The Meteorite Manifestation
    7.1/10(2948 votes)

    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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  19. The Big Bang Theory Season 12 Episode 17 - The Conference Valuation
    7.1/10(2936 votes)

    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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  20. The Big Bang Theory Season 12 Episode 18 - The Laureate Accumulation
    7.1/10(2904 votes)

    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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  21. The Big Bang Theory Season 12 Episode 20 - The Decision Reverberation
    7.1/10(2898 votes)

    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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  22. The Big Bang Theory Season 12 Episode 4 - The Tam Turbulence
    7.0/10(3068 votes)

    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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  23. The Big Bang Theory Season 12 Episode 19 - The Inspiration Deprivation
    7.0/10(2952 votes)

    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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  24. The Big Bang Theory Season 12 Episode 5 - The Planetarium Collision
    6.8/10(3071 votes)

    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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Season 12 Ratings Summary

"Unraveling the Mystery: A Big Bang Farewell" is the best rated episode of "The Big Bang Theory" season 12. It scored 9.5/10 based on 12328 votes. Directed by Unknown and written by Chuck Lorre, it aired on 5/16/2019. This episode is rated 0.5 points higher than the second-best, "The Change Constant / The Stockholm Syndrome".