The WORST Episodes of The Big Bang Theory

Every episode ever - ranked by fan votes!

Last Updated: Jul 5, 2020

Network: CBS

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 - Aired Oct 18, 2018

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 7.46
4,059 votes
Directors: Mark Cendrowski
Writers: Maria Ferrari, Steve Holland, Tara Hernandez
The Solo Oscillation

#2 - The Solo Oscillation

Season 11 - Episode 13 - Aired Jan 11, 2018

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 7.48
5,648 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Jeremy Howe, Maria Ferrari
The Tam Turbulence

#3 - The Tam Turbulence

Season 12 - Episode 4 - Aired Oct 11, 2018

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
4,077 votes
Directors: Mark Cendrowski
Writers: Dave Goetsch, Eric Kaplan, Jeremy Howe
The Inspiration Deprivation

#4 - The Inspiration Deprivation

Season 12 - Episode 19 - Aired Apr 18, 2019

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.

star 7.48
3,375 votes
Directors: Mark Cendrowski
Writers: Anthony Del Broccolo, Steve Holland, Tara Hernandez
The Cornhusker Vortex

#5 - The Cornhusker Vortex

Season 3 - Episode 6 - Aired Nov 2, 2009

Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.

star 7.49
11,933 votes
Directors: Mark Cendrowski
Writers: David Goetsch, Richard Rosenstock
The Speckerman Recurrence

#6 - The Speckerman Recurrence

Season 5 - Episode 11 - Aired Dec 8, 2011

When Leonard's former high school tormentor resurfaces, Leonard must confront him. Meanwhile, Penny realizes she did her fair share of tormenting in the past.

star 7.49
12,144 votes
Directors: Anthony Rich
Writers: Anthony Del Broccolo, Eric Kaplan, Steven Molaro
The Neonatal Nomenclature

#7 - The Neonatal Nomenclature

Season 11 - Episode 16 - Aired Mar 1, 2018

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 7.49
5,277 votes
Directors: Gay Linvill
Writers: Adam Faberman, Steve Holland, Tara Hernandez
The Decision Reverberation

#8 - The Decision Reverberation

Season 12 - Episode 20 - Aired Apr 25, 2019

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.

star 7.50
3,377 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Jeremy Howe, Maria Ferrari
The Cognition Regeneration

#9 - The Cognition Regeneration

Season 10 - Episode 22 - Aired Apr 27, 2017

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

star 7.50
9,380 votes
Directors: Mark Cendrowski
Writers: Dave Goetsch, Eric Kaplan, Jim Reynolds
The Gates Excitation

#10 - The Gates Excitation

Season 11 - Episode 18 - Aired Mar 29, 2018

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 7.51
4,914 votes
Directors: Mark Cendrowski
Writers: Jeremy Howe, Steve Holland, Tara Hernandez
The Explosion Implosion

#11 - The Explosion Implosion

Season 11 - Episode 4 - Aired Oct 16, 2017

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 7.51
7,406 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Jeremy Howe, Steve Holland
The Meteorite Manifestation

#12 - The Meteorite Manifestation

Season 12 - Episode 14 - Aired Jan 31, 2019

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 7.52
3,605 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Jeremy Howe, Tara Hernandez
The Matrimonial Momentum

#13 - The Matrimonial Momentum

Season 9 - Episode 1 - Aired Sep 21, 2015

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.

star 7.52
8,301 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Steve Holland, Steven Molaro
The Helium Insufficiency

#14 - The Helium Insufficiency

Season 9 - Episode 6 - Aired Oct 26, 2015

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 7.52
7,125 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Jim Reynolds, Steven Molaro
The Communication Deterioration

#15 - The Communication Deterioration

Season 8 - Episode 21 - Aired Apr 16, 2015

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 7.52
6,675 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Jim Reynolds, Steven Molaro
The Relaxation Integration

#16 - The Relaxation Integration

Season 11 - Episode 3 - Aired Oct 9, 2017

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 7.52
7,603 votes
Directors: Mark Cendrowski
Writers: Andy Gordon, Maria Ferrari, Tara Hernandez
The Athenaeum Allocation

#17 - The Athenaeum Allocation

Season 11 - Episode 17 - Aired Mar 8, 2018

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
5,139 votes
Directors: Mark Cendrowski
Writers: Dave Goetsch, Eric Kaplan, Maria Ferrari
The Laureate Accumulation

#18 - The Laureate Accumulation

Season 12 - Episode 18 - Aired Apr 4, 2019

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.

star 7.53
3,470 votes
Directors: Mark Cendrowski
Writers: Dave Goetsch, Eric Kaplan, Maria Ferrari
The Retraction Reaction

#19 - The Retraction Reaction

Season 11 - Episode 2 - Aired Oct 2, 2017

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 7.53
8,064 votes
Directors: Mark Cendrowski
Writers: Anthony Del Broccolo, Dave Goetsch, Eric Kaplan
The Celebration Reverberation

#20 - The Celebration Reverberation

Season 11 - Episode 11 - Aired Dec 14, 2017

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
5,895 votes
Directors: Mark Cendrowski
Writers: Dave Goetsch, Jeremy Howe, Maria Ferrari
The Separation Triangulation

#21 - The Separation Triangulation

Season 11 - Episode 14 - Aired Jan 18, 2018

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 7.53
5,586 votes
Directors: Mark Cendrowski
Writers: Steve Holland, Steven Molaro, Tara Hernandez
The Confirmation Polarization

#22 - The Confirmation Polarization

Season 12 - Episode 13 - Aired Jan 17, 2019

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 7.54
3,701 votes
Directors: Mark Cendrowski
Writers: Maria Ferrari, Steve Holland, Tara Hernandez
The Allowance Evaporation

#23 - The Allowance Evaporation

Season 10 - Episode 16 - Aired Feb 16, 2017

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
9,993 votes
Directors: Mark Cendrowski
Writers: Jim Reynolds, Steve Holland, Steven Molaro
The Conference Valuation

#24 - The Conference Valuation

Season 12 - Episode 17 - Aired Mar 7, 2019

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.

star 7.54
3,489 votes
Directors: Mark Cendrowski
Writers: Jeremy Howe, Maria Ferrari, Steve Holland
The Leftover Thermalization

#25 - The Leftover Thermalization

Season 8 - Episode 18 - Aired Mar 12, 2015

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 7.54
6,635 votes
Directors: Mark Cendrowski
Writers: Eric Kaplan, Jim Reynolds, Steve Holland