The Worst Episodes of The Big Bang Theory

Last Updated: Feb 15, 2019

A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.

The Planetarium Collision

#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.

star 7.44
2,976 votes
Writers: Eric Kaplan, Andy Gordon, Alex Ayers, Steve Holland, Maria Ferrari, Tara Hernandez
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The Communication Deterioration

#2 - 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.

star 7.46
4,859 votes
Writers: Dave Goetsch, Steve Holland, Jeremy Howe
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The Helium Insufficiency

#3 - 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.

star 7.46
5,785 votes
Writers: Steven Molaro, Eric Kaplan, Jim Reynolds, Steve Holland, Maria Ferrari, Anthony Del Broccolo
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The Solo Oscillation

#4 - 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.

star 7.46
4,935 votes
Writers: Chuck Lorre, Steve Holland, Anthony Del Broccolo, Eric Kaplan, Maria Ferrari, Jeremy Howe
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The Tam Turbulence

#5 - 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.

star 7.48
2,988 votes
Writers: Steve Holland, Steven Molaro, Maria Ferrari, Dave Goetsch, Eric Kaplan, Jeremy Howe
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The Meteorite Manifestation

#6 - The Meteorite Manifestation

Season 12 - Episode 14

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.

star 7.49
1,857 votes
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The Confirmation Polarization

#7 - The Confirmation Polarization

Season 12 - Episode 13

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 be or not.

star 7.49
2,164 votes
Writers: Eric Kaplan, Andy Gordon, Anthony Del Broccolo, Steve Holland, Maria Ferrari, Tara Hernandez
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The Matrimonial Momentum

#8 - The Matrimonial Momentum

Season 9 - Episode 1

Sheldon is confronted by a mystery of the universe he cannot unravel: when a woman wants time apart to think, exactly how much time does that mean, and is there any way to hurry the process along? In Las Vegas, Penny and Leonard march closer to marching down the aisle, but has Penny gotten over Leonard’s infidelity? And if so, will he do anything to un-get her over it?

star 7.50
6,862 votes
Writers: Chuck Lorre, Jim Reynolds, Maria Ferrari, Steven Molaro, Steve Holland, Eric Kaplan
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The Cognition Regeneration

#9 - The Cognition Regeneration

Season 10 - Episode 22

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

star 7.51
8,600 votes
Writers: Steve Holland, Tara Hernandez, Jeremy Howe, Dave Goetsch, Eric Kaplan, Jim Reynolds
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The Space Probe Disintegration

#10 - The Space Probe Disintegration

Season 8 - Episode 12

Wolowitz tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.

star 7.51
3,536 votes
Writers: Billy Prady, Eric Kaplan, Jim Reynolds
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The Collaboration Fluctuation

#11 - The Collaboration Fluctuation

Season 10 - Episode 19

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

star 7.51
9,262 votes
Writers: Chuck Lorre, Tara Hernandez, Giuseppe Graziano, Steven Molaro, Steve Holland, Dave Goetsch
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The Gates Excitation

#12 - 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.

star 7.52
4,227 votes
Writers: Eric Kaplan, Maria Ferrari, Andy Gordon, Steve Holland, Tara Hernandez, Jeremy Howe
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The Leftover Thermalization

#13 - The Leftover Thermalization

Season 8 - Episode 18

Friction ensues when a magazine fails to mention Leonard in an article about the paper he co-wrote with Sheldon. Also, a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor.

star 7.52
4,699 votes
Writers: Steven Molaro, Maria Ferrari, Jeremy Howe
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The Athenaeum Allocation

#14 - The Athenaeum Allocation

Season 11 - Episode 17

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

star 7.52
4,414 votes
Writers: Steve Holland, Steven Molaro, Tara Hernandez, Dave Goetsch, Eric Kaplan, Maria Ferrari
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The Neonatal Nomenclature

#15 - The Neonatal Nomenclature

Season 11 - Episode 16

When Bernadette won't go into labor, all her friends try different tactics to get things started. Also, Wolowitz confronts Bernadette after Amy accidentally reveals she's already chosen their son's name.

star 7.52
4,551 votes
Directors: Gay Linvill
Writers: Eric Kaplan, Maria Ferrari, Anthony Del Broccolo, Steve Holland, Tara Hernandez, Adam Faberman
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The Separation Triangulation

#16 - The Separation Triangulation

Season 11 - Episode 14

Koothrappali finds himself in the middle of domestic drama when he learns the woman he's dating, Nell, has a very upset husband, Oliver. Also, when Sheldon rents his old room back for a quiet place to work, he drives Leonard crazy by being a model tenant.

star 7.52
4,805 votes
Writers: Chuck Lorre, Eric Kaplan, Maria Ferrari, Steven Molaro, Steve Holland, Tara Hernandez
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The Relaxation Integration

#17 - The Relaxation Integration

Season 11 - Episode 3

As Sheldon stresses about picking a wedding date, Amy tries to convince him he has a more laid-back side. Also, Koothrappali and Stuart compete to win the heart of Bernadette's new coworker, Ruchi.

star 7.53
6,812 votes
Writers: Chuck Lorre, Steve Holland, Adam Faberman, Maria Ferrari, Andy Gordon, Tara Hernandez
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The Celebration Reverberation

#18 - The Celebration Reverberation

Season 11 - Episode 11

Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.

star 7.53
5,104 votes
Writers: Steve Holland, Eric Kaplan, Alex Ayers, Dave Goetsch, Maria Ferrari, Jeremy Howe
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The Citation Negation

#19 - The Citation Negation

Season 12 - Episode 9

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.

star 7.53
2,659 votes
Directors: Kristy Cecil
Writers: Eric Kaplan, Tara Hernandez, Jeremy Howe, Steve Holland, Dave Goetsch, Maria Ferrari
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The Tesla Recoil

#20 - The Tesla Recoil

Season 11 - Episode 8

Leonard and Wolowitz 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 Ruchi is trying to steal her job.

star 7.54
5,536 votes
Directors: Anthony Rich
Writers: Chuck Lorre, Eric Kaplan, Tara Hernandez, Steve Holland, Maria Ferrari, Jeremy Howe
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The Explosion Implosion

#21 - The Explosion Implosion

Season 11 - Episode 4

Wolowitz and Sheldon bond when they drive to the desert to shoot off a model rocket. Also, when Leonard's mom, Beverly, finds a new best friend in Penny, it rubs Leonard the wrong way.

star 7.54
6,599 votes
Writers: Bill Prady, Maria Ferrari, Tara Hernandez, Steve Holland, Eric Kaplan, Jeremy Howe
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The Propagation Proposition

#22 - The Propagation Proposition

Season 12 - Episode 12

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.

star 7.54
2,257 votes
Writers: Chuck Lorre, Jeremy Howe, Maria Ferrari, Dave Goetsch, Steve Holland, Eric Kaplan
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The Allowance Evaporation

#23 - The Allowance Evaporation

Season 10 - Episode 16

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.

star 7.54
9,143 votes
Writers: Eric Kaplan, Maria Ferrari, Jeremy Howe, Steve Molaro, Steve Holland, Jim Reynolds
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The Retraction Reaction

#24 - The Retraction Reaction

Season 11 - Episode 2

Leonard angers the university - and the entire physics community - after he gives an embarrassing interview. Also, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.

star 7.54
7,204 votes
Writers: Steven Molaro, Steve Holland, Maria Ferrari, Dave Goetsch, Eric Kaplan, Anthony Del Broccolo
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The Reclusive Potential

#25 - The Reclusive Potential

Season 11 - Episode 20

Sheldon takes the guys to a cabin in the middle of nowhere to meet a reclusive scientist; Penny and Bernadette improvise Amy's bachelorette party.

star 7.54
3,928 votes
Writers: Maria Ferrari, Anthony Del Broccolo, Tara Hernandez, Steve Holland, Eric Kaplan, Adam Faberman
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