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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

Best Episodes Summary

"Unraveling the Mystery: A Big Bang Farewell" is the best rated episode of "The Big Bang Theory". It scored 9.5/10 based on 11083 votes. Directed by N/A and written by N/A, it aired on 5/16/2019. This episode scored 0.4 points higher than the second highest rated, "The Bath Item Gift Hypothesis".

  • Unraveling the Mystery: A Big Bang Farewell
    9.5/1011,083 votes
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    #1 - Unraveling the Mystery: A Big Bang Farewell

    Season 12 Episode 24 - Aired 5/16/2019

    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
    9.1/107,381 votes
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    #2 - The Bath Item Gift Hypothesis

    Season 2 Episode 11 - Aired 12/15/2008

    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
    9.0/105,637 votes
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    #3 - The Staircase Implementation

    Season 3 Episode 22 - Aired 5/17/2010

    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
    9.0/105,645 votes
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    #4 - The Opening Night Excitation

    Season 9 Episode 11 - Aired 12/17/2015

    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
    9.0/104,486 votes
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    #5 - The Bow Tie Asymmetry

    Season 11 Episode 24 - Aired 5/10/2018

    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
    9.0/105,317 votes
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    #6 - The Change Constant / The Stockholm Syndrome

    Season 12 Episode 23 - Aired 5/16/2019

    Sheldon and Amy await big news. Meanwhile, Penny and Leonard have some big news of their own. Also, Howard and Bernadette face the stressful challenge of leaving their kids for the first time and Raj makes a new friend, as the gang travels together into an uncharted future.

    Director: Mark Cendrowski

    Writer: N/A

  • The Adhesive Duck Deficiency
    8.9/105,870 votes
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    #7 - The Adhesive Duck Deficiency

    Season 3 Episode 8 - Aired 11/16/2009

    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
    8.8/105,269 votes
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    #8 - The Maternal Capacitance

    Season 2 Episode 15 - Aired 2/9/2009

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Thanksgiving Decoupling
    8.8/105,078 votes
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    #9 - The Thanksgiving Decoupling

    Season 7 Episode 9 - Aired 11/21/2013

    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
    8.7/105,353 votes
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    #10 - The Barbarian Sublimation

    Season 2 Episode 3 - Aired 10/6/2008

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Robotic Manipulation
    8.7/104,944 votes
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    #11 - The Robotic Manipulation

    Season 4 Episode 1 - Aired 9/23/2010

    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
    8.7/104,951 votes
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    #12 - The Scavenger Vortex

    Season 7 Episode 3 - Aired 10/3/2013

    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
    8.6/105,049 votes
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    #13 - The Panty Piñata Polarization

    Season 2 Episode 7 - Aired 11/10/2008

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Lunar Excitation
    8.6/104,451 votes
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    #14 - The Lunar Excitation

    Season 3 Episode 23 - Aired 5/24/2010

    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
    8.6/104,576 votes
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    #15 - The Justice League Recombination

    Season 4 Episode 11 - Aired 12/16/2010

    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
    8.5/105,113 votes
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    #16 - The Tangerine Factor

    Season 1 Episode 17 - Aired 5/19/2008

    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
    8.5/104,624 votes
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    #17 - The Vegas Renormalization

    Season 2 Episode 21 - Aired 4/27/2009

    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
    8.5/104,164 votes
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    #18 - The Roommate Transmogrification

    Season 4 Episode 24 - Aired 5/19/2011

    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
    8.5/104,702 votes
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    #19 - The Good Guy Fluctuation

    Season 5 Episode 7 - Aired 10/27/2011

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

    Director: Mark Cendrowski

    Writer: N/A

  • The Hawking Excitation
    8.5/104,401 votes
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    #20 - The Hawking Excitation

    Season 5 Episode 21 - Aired 4/5/2012

    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
    8.5/104,259 votes
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    #21 - The Countdown Reflection

    Season 5 Episode 24 - Aired 5/10/2012

    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
    8.5/103,679 votes
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    #22 - The Long Distance Dissonance

    Season 10 Episode 24 - Aired 5/11/2017

    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
    8.4/104,432 votes
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    #23 - The Gorilla Experiment

    Season 3 Episode 10 - Aired 12/7/2009

    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
    8.4/104,524 votes
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    #24 - The Einstein Approximation

    Season 3 Episode 14 - Aired 2/1/2010

    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
    8.4/104,431 votes
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    #25 - The Precious Fragmentation

    Season 3 Episode 17 - Aired 3/8/2010

    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