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The Worst Episodes of The Big Bang Theory

Every episode of The Big Bang Theory ranked from worst to best. Explore the Worst Episodes of The Big Bang Theory!

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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 Worst Episode
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    The Big Bang Theory Season 10 Episode 22 - The Cognition Regeneration
    6.8/10(2882 votes)

    #1 - The Cognition Regeneration

    S10:E22

    Leonard isn’t thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack.

    Director:Mark Cendrowski
    Writer:Unknown

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  2. The Big Bang Theory Season 11 Episode 17 - The Athenaeum Allocation
    6.8/10(2750 votes)

    #2 - The Athenaeum Allocation

    S11:E17

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

    Director:Mark Cendrowski
    Writer:Unknown

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  3. The Big Bang Theory Season 12 Episode 5 - The Planetarium Collision
    6.8/10(2854 votes)

    #3 - 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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  4. The Big Bang Theory Season 10 Episode 13 - The Romance Recalibration
    6.9/10(3062 votes)

    #4 - The Romance Recalibration

    S10:E13

    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.

    Director:Mark Cendrowski
    Writer:Unknown

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  5. The Big Bang Theory Season 8 Episode 3 - The First Pitch Insufficiency
    7.0/10(3943 votes)

    #5 - The First Pitch Insufficiency

    S8:E3

    Wolowitz feels nervous when he is asked to throw the first pitch at a Los Angeles Angels game. Penny and Leonard want to prove Sheldon wrong after he says he and Amy are the better couple.

    Director:Mark Cendrowski
    Writer:Unknown

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  6. The Big Bang Theory Season 8 Episode 10 - The Champagne Reflection
    7.0/10(3682 votes)

    #6 - The Champagne Reflection

    S8:E10

    While Sheldon says a tearful goodbye to the final installment of "Fun with Flags", Leonard, Howard and Raj search for something significant in a dead professor's research. And Bernadette finds out what her colleagues really think of her.

    Director:Mark Cendrowski
    Writer:Unknown

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  7. The Big Bang Theory Season 8 Episode 21 - The Communication Deterioration
    7.0/10(3327 votes)

    #7 - The Communication Deterioration

    S8:E21

    When Raj is asked to create a message in case a NASA mission discovers alien life, the guys fight over what he should do. Also, Penny is torn between auditioning for a movie or keeping her successful pharmaceutical sales job.

    Director:Mark Cendrowski
    Writer:Unknown

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  8. The Big Bang Theory Season 11 Episode 3 - The Relaxation Integration
    7.0/10(2982 votes)

    #8 - The Relaxation Integration

    S11:E3

    Sheldon and Amy struggle with picking a wedding date, which stresses out Sheldon and causes him talking in his sleep. Meanwhile, Raj and Stuart fight over the attention of one of Bernadette's co-workers.

    Director:Mark Cendrowski
    Writer:Unknown

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  9. The Big Bang Theory Season 12 Episode 4 - The Tam Turbulence
    7.0/10(2851 votes)

    #9 - 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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  10. The Big Bang Theory Season 12 Episode 19 - The Inspiration Deprivation
    7.0/10(2739 votes)

    #10 - 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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  11. The Big Bang Theory Season 10 Episode 16 - The Allowance Evaporation
    7.1/10(2870 votes)

    #11 - The Allowance Evaporation

    S10:E16

    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.

    Director:Mark Cendrowski
    Writer:Unknown

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  12. The Big Bang Theory Season 10 Episode 18 - The Escape Hatch Identification
    7.1/10(2876 votes)

    #12 - The Escape Hatch Identification

    S10:E18

    When Raj moves out of his apartment, Leonard and Penny offer him Sheldon's old room.

    Director:Mark Cendrowski
    Writer:Unknown

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  13. The Big Bang Theory Season 10 Episode 19 - The Collaboration Fluctuation
    7.1/10(2927 votes)

    #13 - The Collaboration Fluctuation

    S10:E19

    Leonard, Penny and Raj adjust to their new living arrangement, and Sheldon takes an interest in Amy’s work.

    Director:Mark Cendrowski
    Writer:Unknown

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  14. The Big Bang Theory Season 10 Episode 23 - The Gyroscopic Collapse
    7.1/10(2832 votes)

    #14 - The Gyroscopic Collapse

    S10:E23

    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.

    Director:Anthony Rich
    Writer:Unknown

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  15. The Big Bang Theory Season 11 Episode 4 - The Explosion Implosion
    7.1/10(2915 votes)

    #15 - The Explosion Implosion

    S11:E4

    As Howard worries about fatherhood, he and Sheldon bond when they jointly assemble a model rocket. Meanwhile, Penny bonds with Leonard's mother, Beverly, much to his concern.

    Director:Mark Cendrowski
    Writer:Unknown

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  16. The Big Bang Theory Season 11 Episode 8 - The Tesla Recoil
    7.1/10(2833 votes)

    #16 - The Tesla Recoil

    S11:E8

    Leonard and Howard are furious after they learn Sheldon went to work with the military behind their backs. Also, while Bernadette is on bed rest, she asks Raj to do some digging when she suspects that Ruchi might be trying to take over her projects at work.

    Director:Anthony Rich
    Writer:Unknown

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  17. The Big Bang Theory Season 11 Episode 11 - The Celebration Reverberation
    7.1/10(2792 votes)

    #17 - The Celebration Reverberation

    S11:E11

    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. Also, Leonard gets a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.

    Director:Mark Cendrowski
    Writer:Unknown

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  18. The Big Bang Theory Season 11 Episode 16 - The Neonatal Nomenclature
    7.1/10(2733 votes)

    #18 - The Neonatal Nomenclature

    S11:E16

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

    Director:Gay Linvill
    Writer:Unknown

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  19. The Big Bang Theory Season 11 Episode 18 - The Gates Excitation
    7.1/10(2790 votes)

    #19 - The Gates Excitation

    S11:E18

    Bill Gates visits Penny's work, and the gang schemes to meet him. Hilarity ensues. Meanwhile, Sheldon is convinced that he's a target of an April's Fools prank.

    Director:Mark Cendrowski
    Writer:Unknown

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  20. The Big Bang Theory Season 12 Episode 12 - The Propagation Proposition
    7.1/10(2724 votes)

    #20 - 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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  21. The Big Bang Theory Season 12 Episode 13 - The Confirmation Polarization
    7.1/10(2751 votes)

    #21 - 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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  22. The Big Bang Theory Season 12 Episode 14 - The Meteorite Manifestation
    7.1/10(2733 votes)

    #22 - 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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  23. The Big Bang Theory Season 12 Episode 17 - The Conference Valuation
    7.1/10(2730 votes)

    #23 - 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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  24. The Big Bang Theory Season 12 Episode 18 - The Laureate Accumulation
    7.1/10(2698 votes)

    #24 - 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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  25. The Big Bang Theory Season 12 Episode 20 - The Decision Reverberation
    7.1/10(2693 votes)

    #25 - 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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Worst Episodes Summary

"The Cognition Regeneration" is the worst rated episode of "The Big Bang Theory". It scored 6.8/10 based on 2882 votes. Directed by Mark Cendrowski and written by Unknown, it aired on 4/27/2017. This episode scored 0.0 points lower than the second lowest rated, "The Athenaeum Allocation".