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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!

Binge this in 7h 58m•Peaking at 9.1/10

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

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Episode Rankings

  1. #1 Fan Favorite
    The Big Bang Theory Season 2 Episode 1 - The Bad Fish Paradigm
    8.2/10(5392 votes)

    #1 - The Bad Fish Paradigm

    S2:E1

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

    Director:Mark Cendrowski
    Writer:Unknown

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  2. The Big Bang Theory Season 2 Episode 2 - The Codpiece Topology
    8.0/10(4995 votes)

    #2 - The Codpiece Topology

    S2:E2

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

    Director:Mark Cendrowski
    Writer:Unknown

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  3. The Big Bang Theory Season 2 Episode 3 - The Barbarian Sublimation
    8.7/10(5802 votes)

    #3 - The Barbarian Sublimation

    S2:E3

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

    Director:Mark Cendrowski
    Writer:Unknown

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  4. The Big Bang Theory Season 2 Episode 4 - The Griffin Equivalency
    7.9/10(5042 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  5. The Big Bang Theory Season 2 Episode 5 - The Euclid Alternative
    8.3/10(5165 votes)

    #5 - The Euclid Alternative

    S2:E5

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

    Director:Mark Cendrowski
    Writer:Unknown

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  6. The Big Bang Theory Season 2 Episode 6 - The Cooper-Nowitzki Theorem
    8.1/10(5177 votes)

    #6 - The Cooper-Nowitzki Theorem

    S2:E6

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

    Director:Mark Cendrowski
    Writer:Unknown

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  7. The Big Bang Theory Season 2 Episode 7 - The Panty Piñata Polarization
    8.6/10(5474 votes)

    #7 - The Panty Piñata Polarization

    S2:E7

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

    Director:Mark Cendrowski
    Writer:Unknown

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  8. The Big Bang Theory Season 2 Episode 8 - The Lizard-Spock Expansion
    8.0/10(4948 votes)

    #8 - The Lizard-Spock Expansion

    S2:E8

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

    Director:Mark Cendrowski
    Writer:Unknown

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  9. The Big Bang Theory Season 2 Episode 9 - The White Asparagus Triangulation
    8.1/10(4898 votes)

    #9 - The White Asparagus Triangulation

    S2:E9

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

    Director:Mark Cendrowski
    Writer:Unknown

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  10. The Big Bang Theory Season 2 Episode 10 - The Vartabedian Conundrum
    7.6/10(4803 votes)

    #10 - The Vartabedian Conundrum

    S2:E10

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

    Director:Mark Cendrowski
    Writer:Unknown

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  11. The Big Bang Theory Season 2 Episode 11 - The Bath Item Gift Hypothesis
    9.1/10(7947 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  12. The Big Bang Theory Season 2 Episode 12 - The Killer Robot Instability
    7.8/10(4841 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  13. The Big Bang Theory Season 2 Episode 13 - The Friendship Algorithm
    7.9/10(4810 votes)

    #13 - The Friendship Algorithm

    S2:E13

    Sheldon creates a scientific procedure for making friends.

    Director:Mark Cendrowski
    Writer:Unknown

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  14. The Big Bang Theory Season 2 Episode 14 - The Financial Permeability
    8.0/10(4768 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  15. The Big Bang Theory Season 2 Episode 15 - The Maternal Capacitance
    8.8/10(5711 votes)

    #15 - The Maternal Capacitance

    S2:E15

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

    Director:Mark Cendrowski
    Writer:Unknown

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  16. The Big Bang Theory Season 2 Episode 16 - The Cushion Saturation
    8.1/10(4780 votes)

    #16 - The Cushion Saturation

    S2:E16

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

    Director:Mark Cendrowski
    Writer:Unknown

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  17. The Big Bang Theory Season 2 Episode 17 - The Terminator Decoupling
    8.0/10(5143 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  18. The Big Bang Theory Season 2 Episode 18 - The Work Song Nanocluster
    8.1/10(4805 votes)

    #18 - The Work Song Nanocluster

    S2:E18

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

    Director:Peter Chakos
    Writer:Unknown

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  19. The Big Bang Theory Season 2 Episode 19 - The Dead Hooker Juxtaposition
    8.1/10(4852 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."

    Director:Mark Cendrowski
    Writer:Steven Molaro

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  20. The Big Bang Theory Season 2 Episode 20 - The Hofstadter Isotope
    7.8/10(4652 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.

    Director:Mark Cendrowski
    Writer:David Goetsch

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  21. The Big Bang Theory Season 2 Episode 21 - The Vegas Renormalization
    8.4/10(5008 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  22. The Big Bang Theory Season 2 Episode 22 - The Classified Materials Turbulence
    8.1/10(4606 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.

    Director:Mark Cendrowski
    Writer:Unknown

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  23. The Big Bang Theory Season 2 Episode 23 - The Monopolar Expedition
    8.2/10(4747 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.

    Director:Mark Cendrowski
    Writers:Eric Kaplan, Richard A. Rosenstock

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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 8.2/10 based on 5392 votes. Directed by Mark Cendrowski and written by Unknown, it aired on 9/22/2008. This episode is rated 0.2 points higher than the second-best, "The Codpiece Topology".