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The Best Episodes of The Big Bang Theory

Every episode of The Big Bang Theory ranked from best to worst. Let's dive into the Best Episodes of The Big Bang Theory!

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.

Genre:Comedy
Network:CBS

Top Episode Highlight

The best episode of "The Big Bang Theory" is "Unraveling the Mystery: A Big Bang Farewell", rated 9.5/10 from 10608 user votes. It was directed by N/A and written by N/A. "Unraveling the Mystery: A Big Bang Farewell" aired on 5/16/2019 and is rated 0.4 point(s) higher than the second highest rated, "The Bath Item Gift Hypothesis".

  • Unraveling the Mystery: A Big Bang Farewell
    9.5/10 10,608 votes

    #1 - Unraveling the Mystery: A Big Bang Farewell

    Season 12 Episode 24 - Aired 2019-05-16

    Johnny Galecki and Kaley Cuoco will lead fans on a trip down memory lane, sharing some of the best-kept backstage secrets and personal memories from the past 12 years.

    Director: N/A

    Writer: N/A

  • The Bath Item Gift Hypothesis
    9.1/10 7,059 votes

    #2 - The Bath Item Gift Hypothesis

    Season 2 Episode 11 - Aired 2008-12-15

    Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

    Director: Mark Cendrowski

    Writer: N/A

  • The Staircase Implementation
    9.0/10 5,406 votes

    #3 - The Staircase Implementation

    Season 3 Episode 22 - Aired 2010-05-17

    Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.

    Director: Mark Cendrowski

    Writer: N/A

  • The Opening Night Excitation
    9.0/10 5,429 votes

    #4 - The Opening Night Excitation

    Season 9 Episode 11 - Aired 2015-12-17

    After more than five years of dating, Sheldon and Amy spend their first night together. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket.

    Director: Mark Cendrowski

    Writer: N/A

  • The Bow Tie Asymmetry
    9.0/10 4,271 votes

    #5 - The Bow Tie Asymmetry

    Season 11 Episode 24 - Aired 2018-05-10

    When Amy's parents and Sheldon's family arrive, everybody is focused to make sure all wedding arrangements go according to plan – everyone except the bride and groom.

    Director: Mark Cendrowski

    Writer: N/A

  • The Change Constant / The Stockholm Syndrome
    9.0/10 5,107 votes

    #6 - The Change Constant / The Stockholm Syndrome

    Season 12 Episode 23 - Aired 2019-05-16

    Sheldon and Amy await big news.

    Director: Mark Cendrowski

    Writer: N/A

  • The Adhesive Duck Deficiency
    8.9/10 5,611 votes

    #7 - The Adhesive Duck Deficiency

    Season 3 Episode 8 - Aired 2009-11-16

    With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.

    Director: Mark Cendrowski

    Writer: N/A

  • The Maternal Capacitance
    8.8/10 5,041 votes

    #8 - The Maternal Capacitance

    Season 2 Episode 15 - Aired 2009-02-09

    Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

    Director: Mark Cendrowski

    Writer: N/A

  • The Thanksgiving Decoupling
    8.8/10 4,856 votes

    #9 - The Thanksgiving Decoupling

    Season 7 Episode 9 - Aired 2013-11-21

    Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.

    Director: Mark Cendrowski

    Writer: N/A

  • The Barbarian Sublimation
    8.7/10 5,090 votes

    #10 - The Barbarian Sublimation

    Season 2 Episode 3 - Aired 2008-10-06

    Sheldon creates a monster when he introduces Penny to online gaming.

    Director: Mark Cendrowski

    Writer: N/A

  • The Robotic Manipulation
    8.7/10 4,742 votes

    #11 - The Robotic Manipulation

    Season 4 Episode 1 - Aired 2010-09-23

    Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.

    Director: Mark Cendrowski

    Writer: N/A

  • The Scavenger Vortex
    8.7/10 4,761 votes

    #12 - The Scavenger Vortex

    Season 7 Episode 3 - Aired 2013-10-03

    When the entire gang competes in a scavenger hunt designed by Raj, it brings out the best - and worst - in everyone.

    Director: Mark Cendrowski

    Writer: N/A

  • The Panty Piñata Polarization
    8.6/10 4,823 votes

    #13 - The Panty Piñata Polarization

    Season 2 Episode 7 - Aired 2008-11-10

    When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.

    Director: Mark Cendrowski

    Writer: N/A

  • The Lunar Excitation
    8.6/10 4,250 votes

    #14 - The Lunar Excitation

    Season 3 Episode 23 - Aired 2010-05-24

    While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.

    Director: Peter Chakos

    Writer: N/A

  • The Justice League Recombination
    8.6/10 4,381 votes

    #15 - The Justice League Recombination

    Season 4 Episode 11 - Aired 2010-12-16

    The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

    Director: Mark Cendrowski

    Writer: N/A

  • The Tangerine Factor
    8.5/10 4,868 votes

    #16 - The Tangerine Factor

    Season 1 Episode 17 - Aired 2008-05-19

    Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.

    Director: Mark Cendrowski

    Writer: N/A

  • The Vegas Renormalization
    8.5/10 4,424 votes

    #17 - The Vegas Renormalization

    Season 2 Episode 21 - Aired 2009-04-27

    Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.

    Director: Mark Cendrowski

    Writer: N/A

  • The Roommate Transmogrification
    8.5/10 3,988 votes

    #18 - The Roommate Transmogrification

    Season 4 Episode 24 - Aired 2011-05-19

    When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.

    Director: Mark Cendrowski

    Writer: N/A

  • The Good Guy Fluctuation
    8.5/10 4,524 votes

    #19 - The Good Guy Fluctuation

    Season 5 Episode 7 - Aired 2011-10-27

    A cute comic book artist puts Leonard and Priya’s relationship to the test, while Sheldon tries to scare the guys for Halloween.

    Director: Mark Cendrowski

    Writer: N/A

  • The Hawking Excitation
    8.5/10 4,228 votes

    #20 - The Hawking Excitation

    Season 5 Episode 21 - Aired 2012-04-05

    When Wolowitz gets to work with Stephen Hawking, Sheldon is willing to do anything to meet his hero.

    Director: Mark Cendrowski

    Writer: N/A

  • The Countdown Reflection
    8.5/10 4,086 votes

    #21 - The Countdown Reflection

    Season 5 Episode 24 - Aired 2012-05-10

    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.

    Director: Mark Cendrowski

    Writer: N/A

  • The Long Distance Dissonance
    8.5/10 3,518 votes

    #22 - The Long Distance Dissonance

    Season 10 Episode 24 - Aired 2017-05-11

    The gang is concerned when Sheldon’s former admirer, Dr. Ramona Nowitzki, resurfaces while Amy is away at Princeton.

    Director: Mark Cendrowski

    Writer: N/A

  • The Gorilla Experiment
    8.4/10 4,241 votes

    #23 - The Gorilla Experiment

    Season 3 Episode 10 - Aired 2009-12-07

    Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.

    Director: Mark Cendrowski

    Writer: N/A

  • The Einstein Approximation
    8.4/10 4,308 votes

    #24 - The Einstein Approximation

    Season 3 Episode 14 - Aired 2010-02-01

    Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.

    Director: Mark Cendrowski

    Writer: N/A

  • The Precious Fragmentation
    8.4/10 4,236 votes

    #25 - The Precious Fragmentation

    Season 3 Episode 17 - Aired 2010-03-08

    When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.

    Director: Mark Cendrowski

    Writer: N/A