The WORST Episodes of The Big Bang Theory
Every episode ever - ranked by fan votes!
Last Updated: Jul 5, 2020
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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.
#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.