The BEST Episodes of The Big Bang Theory
Every episode ever - ranked by fan votes!
Last Updated: Mar 6, 2021
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 Stockholm Syndrome
Season 12 - Episode 24 - Aired May 16, 2019
Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; and Koothrappali makes a new friend, as the gang travels together into an uncharted future.
#2 - The Change Constant
Season 12 - Episode 23 - Aired May 16, 2019
Sheldon and Amy await big news.
#3 - The Long Distance Dissonance
Season 10 - Episode 24 - Aired May 11, 2017
The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.
#4 - The Opening Night Excitation
Season 9 - Episode 11 - Aired Dec 17, 2015
As the guys prepare to go to the premiere of the new Star Wars movie, Sheldon plans a special event for Amy's birthday.
#5 - The Bow Tie Asymmetry
Season 11 - Episode 24 - Aired May 10, 2018
When Amy’s parents and Sheldon’s family arrive for the wedding, everybody is focused on making sure all goes according to plan – everyone except the bride and groom.
#6 - The Bath Item Gift Hypothesis
Season 2 - Episode 11 - Aired Dec 15, 2008
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
#7 - The Thanksgiving Decoupling
Season 7 - Episode 9 - Aired Nov 21, 2013
An upset Sheldon protests when the entire gang drags him to Mrs. Wolowitz's house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.
#8 - The Good Guy Fluctuation
Season 5 - Episode 7 - Aired Oct 27, 2011
A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.
#9 - The Roommate Transmogrification
Season 4 - Episode 24 - Aired May 19, 2011
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap apartments and Penny does something she regrets.
#10 - The Romance Resonance
Season 7 - Episode 6 - Aired Oct 24, 2013
Sheldon's latest scientific breakthrough makes him feel like a fraud – and threatens to haunt him forever. Meanwhile, Howard's romantic gesture to Bernadette causes Penny to step up her game with Leonard.
#11 - The Fish Guts Displacement
Season 6 - Episode 10 - Aired Dec 6, 2012
When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.
#12 - The Egg Salad Equivalency
Season 6 - Episode 12 - Aired Jan 3, 2013
When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Wolowitz in trouble too.
#13 - The Indecision Amalgamation
Season 7 - Episode 19 - Aired Apr 3, 2014
Raj struggles with guilt when he dates two women at once; Penny has a chance to play a part in a cheesy movie; Sheldon is torn between two gaming systems.
#14 - The Pants Alternative
Season 3 - Episode 18 - Aired Mar 22, 2010
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
#15 - The Closure Alternative
Season 6 - Episode 21 - Aired Apr 25, 2013
Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.
#16 - The Countdown Reflection
Season 5 - Episode 24 - Aired May 10, 2012
As Howard's mission to space approaches, Howard and Bernadette decide to get married before his launch, causing the gang to scurry into overdrive in an effort to stage the wedding.
#17 - The Locomotive Manipulation
Season 7 - Episode 15 - Aired Feb 6, 2014
On Valentine's Day, Sheldon and Amy go on a trip to wine country with Howard and Bernadette; Penny and Leonard rush Raj's dog to the vet.
#18 - The Bakersfield Expedition
Season 6 - Episode 13 - Aired Jan 10, 2013
As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.
#19 - The Lunar Excitation
Season 3 - Episode 23 - Aired May 24, 2010
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.
#20 - The Scavenger Vortex
Season 7 - Episode 3 - Aired Oct 3, 2013
When the entire gang competes in a cutthroat scavenger hunt designed by Raj that tests their science knowledge and street smarts, it brings out the best – and worst – in everyone.
#21 - The 43 Peculiarity
Season 6 - Episode 8 - Aired Nov 15, 2012
Raj and Howard try to to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.
#22 - The Tangerine Factor
Season 1 - Episode 17 - Aired May 19, 2008
Penny's break-up spurs Leonard to summon up the courage to ask her out, and each head to Sheldon for advice on their upcoming date.
#23 - The Status Quo Combustion
Season 7 - Episode 24 - Aired May 15, 2014
Faced with an uncertain future, Sheldon considers a major change; Emily and Raj decide to take things to the next level. Also, Howard and Bernadette struggle to care for Mrs. Wolowitz when she is injured.
#24 - The Prestidigitation Approximation
Season 4 - Episode 18 - Aired Mar 10, 2011
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
#25 - The Staircase Implementation
Season 3 - Episode 22 - Aired May 17, 2010
Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.