The BEST Episodes of The Big Bang Theory
Every episode ever - ranked by fan votes!
Last Updated: Aug 20, 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.
#1 - The Stockholm Syndrome
Season 12 - Episode 24
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 Bath Item Gift Hypothesis
Season 2 - Episode 11
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
#3 - The Thanksgiving Decoupling
Season 7 - Episode 9
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.
#4 - The Change Constant
Season 12 - Episode 23
Sheldon and Amy await big news.
#5 - The Roommate Transmogrification
Season 4 - Episode 24
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.
#6 - The Countdown Reflection
Season 5 - Episode 24
The fifth season ends with Howard and Bernadette deciding to get married before his NASA mission, causing the gang to scurry into overdrive in an effort to stage the wedding. NASA astronaut Mike Massimino has a cameo as himself.
#7 - The Good Guy Fluctuation
Season 5 - Episode 7
A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.
#8 - The Scavenger Vortex
Season 7 - Episode 3
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.
#9 - The Lunar Excitation
Season 3 - Episode 23
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.
#10 - The Romance Resonance
Season 7 - Episode 6
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 Closure Alternative
Season 6 - Episode 21
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.
#12 - The Love Spell Potential
Season 6 - Episode 23
Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.
#13 - The Hawking Excitation
Season 5 - Episode 21
When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.
#14 - The Long Distance Dissonance
Season 10 - Episode 24
The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.
#15 - The Opening Night Excitation
Season 9 - Episode 11
As the guys prepare to go to the premiere of the new Star Wars movie, Sheldon plans a special event for Amy's birthday.
#16 - The Beta Test Initiation
Season 5 - Episode 14
Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a "woman" he can talk to without being drunk, in the form of Siri on his new phone. Meanwhile, Sheldon decides to start a YouTube series entitled "Sheldon Cooper presents Fun with Flags" with the help of Amy.
#17 - The Launch Acceleration
Season 5 - Episode 23
When NASA moves up Howard's mission, he must face his fears and Bernadette's dad, thus putting the wedding plans in jeopardy. Meanwhile, Leonard says something surprising to Penny in the bedroom.
#18 - The Bow Tie Asymmetry
Season 11 - Episode 24
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.
#19 - The Werewolf Transformation
Season 5 - Episode 18
Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes Howard to reconsider wanting to go into space. Penny beats Leonard in chess, the first time she plays.
#20 - The Indecision Amalgamation
Season 7 - Episode 19
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.
#21 - The Tenure Turbulence
Season 6 - Episode 20
The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.
#22 - The Prestidigitation Approximation
Season 4 - Episode 18
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
#23 - The Fish Guts Displacement
Season 6 - Episode 10
When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.
#24 - The Staircase Implementation
Season 3 - Episode 22
Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
#25 - The Bakersfield Expedition
Season 6 - Episode 13
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.