The Big Bang Theory

10 Worst Episodes of The Big Bang Theory

The Big Bang Theory, which is available on CBS, first aired in 2007 and has since had 13 seasons. It follows the lives of five characters living in Pasadena, California, and tells the story of their geekiness and intellect and the contrast between them and Penny's social skills and common sense. In this article, we will be ranking the worst episodes of The Big Bang Theory.

Although The Big Bang Theory has been highly acclaimed, there have been some episodes that have been less than stellar. We have gone through all of the episodes and have ranked them according to their quality. These are the worst episodes of the show, from least to most disliked.

So if you are a fan of The Big Bang Theory, read on to find out which episodes you should avoid! We will also give you our opinion on why each episode ended up on this list.

Written by Sophie and last updated on jun 16, 2024.

PS: The following content contains spoilers!

PPS: I will admit that parts of this page was written with the help of AI - it makes my work so much easier to not start from a blank page!

The Big Bang Theory - S11E18

#10 - The Gates Excitation (Season 11 - Episode 18)

Penny gets the opportunity to host Bill Gates at work when his company wants to partner with her pharmaceutical company. Also, Leonard, Koothrappali and Wolowitz do everything in their power to meet him, while Sheldon thinks he is the victim of an April Fools prank.

The episode was rated 7.50 from 4575 votes.

The Big Bang Theory - S9E1

#9 - The Matrimonial Momentum (Season 9 - Episode 1)


Sheldon is confronted by a mystery of the universe he cannot unravel: when Amy presses pause on their relationship. Meanwhile, in Las Vegas, Penny struggles with Leonard's confession that he kissed another girl.

The episode was rated 7.50 from 7068 votes.

The Big Bang Theory - S12E18

#8 - The Laureate Accumulation (Season 12 - Episode 18)

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 leads to opportunity and conflict for Howard, Bernadette and Stuart.

The episode was rated 7.49 from 3285 votes.

The Big Bang Theory - S11E13

#7 - The Solo Oscillation (Season 11 - Episode 13)


When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Also, Bert the geologist replaces Wolowitz in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.

The episode was rated 7.47 from 5255 votes.

The Big Bang Theory - S9E6

#6 - The Helium Insufficiency (Season 9 - Episode 6)

In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.

The episode was rated 7.46 from 5976 votes.

The Big Bang Theory - S8E21

#5 - The Communication Deterioration (Season 8 - Episode 21)


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.

The episode was rated 7.46 from 5024 votes.

The Big Bang Theory - S12E20

#4 - The Decision Reverberation (Season 12 - Episode 20)

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.

The episode was rated 7.45 from 3194 votes.

The Big Bang Theory - S12E4

#3 - The Tam Turbulence (Season 12 - Episode 4)


When Sheldon won’t tell anyone why he’s never mentioned Tam, his childhood best friend, 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.

The episode was rated 7.45 from 3784 votes.

The Big Bang Theory - S12E19

#2 - The Inspiration Deprivation (Season 12 - Episode 19)

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, Koothrappali and Wolowitz try to relive the good old days after Wolowitz buys a scooter that looks like the one he had years ago.

The episode was rated 7.45 from 3193 votes.

The Big Bang Theory - S12E5

#1 - The Planetarium Collision (Season 12 - Episode 5)


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. Also, Koothrappali doesn’t want Wolowitz to join him in hosting a show at the planetarium.

The episode was rated 7.44 from 3795 votes.

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