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The Best Episodes of The Big Bang Theory Season 2

Every episode of The Big Bang Theory Season 2 ranked from best to worst. Discover the Best Episodes of The Big Bang Theory Season 2!

The Best Episodes of The Big Bang Theory Season 2

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
  1. Background image for The Bad Fish Paradigm
    7.8/10(61 votes)

    #1 - The Bad Fish Paradigm

    S2:E1

    Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

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    Writer:Unknown
  2. Background image for The Codpiece Topology
    7.5/10(47 votes)

    #2 - The Codpiece Topology

    S2:E2

    A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

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    Writer:Unknown
  3. Background image for The Barbarian Sublimation
    7.8/10(52 votes)

    #3 - The Barbarian Sublimation

    S2:E3

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

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    Writer:Unknown
  4. Background image for The Griffin Equivalency
    7.5/10(49 votes)

    #4 - The Griffin Equivalency

    S2:E4

    Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

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    Writer:Unknown
  5. Background image for The Euclid Alternative
    7.4/10(49 votes)

    #5 - The Euclid Alternative

    S2:E5

    Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

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    Writer:Unknown
  6. Background image for The Cooper-Nowitzki Theorem
    7.8/10(51 votes)

    #6 - The Cooper-Nowitzki Theorem

    S2:E6

    Sheldon and the gang are confused when a young grad student is attracted to him.

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    Writer:Unknown
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  8. Background image for The Panty Piñata Polarization
    7.9/10(49 votes)

    #7 - The Panty Piñata Polarization

    S2:E7

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

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    Writer:Unknown
  9. Background image for The Lizard-Spock Expansion
    7.4/10(47 votes)

    #8 - The Lizard-Spock Expansion

    S2:E8

    Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

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    Writer:Unknown
  10. Background image for The White Asparagus Triangulation
    7.4/10(48 votes)

    #9 - The White Asparagus Triangulation

    S2:E9

    Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

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    Writer:Unknown
  11. Background image for The Vartabedian Conundrum
    7.0/10(49 votes)

    #10 - The Vartabedian Conundrum

    S2:E10

    Leonard asks Penny for advice when his new relationship starts moving too fast.

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    Writer:Unknown
  12. Background image for The Bath Item Gift Hypothesis
    8.1/10(58 votes)

    #11 - The Bath Item Gift Hypothesis

    S2:E11

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

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    Writer:Unknown
  13. Background image for The Killer Robot Instability
    7.4/10(47 votes)

    #12 - The Killer Robot Instability

    S2:E12

    Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.

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    Writer:Unknown
  14. Background image for The Friendship Algorithm
    7.4/10(49 votes)

    #13 - The Friendship Algorithm

    S2:E13

    Sheldon creates a scientific procedure for making friends.

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    Writer:Unknown
  15. Background image for The Financial Permeability
    7.3/10(47 votes)

    #14 - The Financial Permeability

    S2:E14

    Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

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    Writer:Unknown
  16. Background image for The Maternal Capacitance
    8.1/10(48 votes)

    #15 - The Maternal Capacitance

    S2:E15

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

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    Writer:Unknown
  17. Background image for The Cushion Saturation
    7.4/10(48 votes)

    #16 - The Cushion Saturation

    S2:E16

    A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

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    Writer:Unknown
  18. Background image for The Terminator Decoupling
    7.4/10(50 votes)

    #17 - The Terminator Decoupling

    S2:E17

    Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.

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    Writer:Unknown
  19. Background image for The Work Song Nanocluster
    7.5/10(46 votes)

    #18 - The Work Song Nanocluster

    S2:E18

    Penny's home business turns into a complete nightmare when Sheldon takes over.

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    Director:Peter Chakos
    Writer:Unknown
  20. Background image for The Dead Hooker Juxtaposition
    7.5/10(47 votes)

    #19 - The Dead Hooker Juxtaposition

    S2:E19

    Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

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  21. Background image for The Hofstadter Isotope
    7.6/10(45 votes)

    #20 - The Hofstadter Isotope

    S2:E20

    A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

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  22. Background image for The Vegas Renormalization
    7.5/10(49 votes)

    #21 - The Vegas Renormalization

    S2:E21

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

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    Writer:Unknown
  23. Background image for The Classified Materials Turbulence
    7.4/10(45 votes)

    #22 - The Classified Materials Turbulence

    S2:E22

    Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.

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    Writer:Unknown
  24. Background image for The Monopolar Expedition
    7.5/10(46 votes)

    #23 - The Monopolar Expedition

    S2:E23

    The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.

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Season 2 Ratings Summary

"The Bad Fish Paradigm" is the best rated episode of "The Big Bang Theory" season 2. It scored 7.8/10 based on 61 votes. Directed by Mark Cendrowski and written by Unknown, it aired on 9/22/2008. This episode is rated 0.3 points higher than the second-best, "The Codpiece Topology".