Every Episode Of 'The Big Bang Theory' Season 2, Ranked

Reference
Updated May 16, 2024 23 items
Ranked By
458 votes
59 voters

There are so many great episodes of The Big Bang Theory in season 2, but which are your absolute favorite? This list ranks every episode of The Big Bang Theory season 2 from the best to worst, with the help of your votes.

The second season of The Big Bang Theory premiered on September 22, 2008, and consisted of 23 episodes. Season 2 of The Big Bang Theory picks up right after the first finale where Penny and Leonard have a date. The season received three Emmy nominations, including Jim Parsons's first for "Outstanding Lead Actor in a Comedy Series."

Which The Big Bang Theory season 2 episode did you like better, "The Financial Permeability" or "The Euclid Alternative"? Vote up the best episodes from The Big Bang Theory season 2 that you'd like to see at the top of the list.

  • The Bath Item Gift Hypothesis
    1

    The Bath Item Gift Hypothesis

    December 15, 2008
    26 votes
    Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
  • The Panty Piñata Polarization
    2

    The Panty Piñata Polarization

    November 10, 2008
    24 votes
    When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
  • The Barbarian Sublimation
    3

    The Barbarian Sublimation

    October 06, 2008
    19 votes
    Sheldon creates a monster when he introduces Penny to online gaming.
  • The Dead Hooker Juxtaposition
    4

    The Dead Hooker Juxtaposition

    March 30, 2009
    11 votes
    Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
  • The Monopolar Expedition
    5

    The Monopolar Expedition

    May 11, 2009
    14 votes
    The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
  • The Bad Fish Paradigm
    6

    The Bad Fish Paradigm

    September 22, 2008
    14 votes
    Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
  • The Hofstadter Isotope
    7

    The Hofstadter Isotope

    April 13, 2009
    21 votes
    A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
  • The Euclid Alternative
    8

    The Euclid Alternative

    October 20, 2008
    17 votes
    Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
  • The Financial Permeability
    9

    The Financial Permeability

    February 02, 2009
    13 votes
    Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
  • The Cushion Saturation
    10

    The Cushion Saturation

    March 02, 2009
    13 votes
    A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
  • The Friendship Algorithm
    11

    The Friendship Algorithm

    January 19, 2009
    13 votes
    Sheldon creates a scientific procedure for making friends.
  • The Terminator Decoupling
    12

    The Terminator Decoupling

    March 09, 2009
    12 votes
    "The Terminator Decoupling" is an episode of the United States television series The Big Bang Theory that first aired on CBS on March 9, 2009. It is the seventeenth episode of the second season of the series and the thirty-fourth episode overall. The episode features guest appearances by actress Summer Glau and cosmologist George Smoot.
  • The Codpiece Topology
    13

    The Codpiece Topology

    September 29, 2008
    15 votes
    A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
  • The Vegas Renormalization
    14

    The Vegas Renormalization

    April 27, 2009
    15 votes
    Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
  • The Work Song Nanocluster
    15

    The Work Song Nanocluster

    March 16, 2009
    17 votes
    Penny's home business turns into a complete nightmare when Sheldon takes over.
  • The Killer Robot Instability
    16

    The Killer Robot Instability

    January 12, 2009
    14 votes
    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.
  • The Lizard-Spock Expansion
    17

    The Lizard-Spock Expansion

    November 17, 2008
    12 votes
    Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
  • The Classified Materials Turbulence
    18

    The Classified Materials Turbulence

    May 04, 2009
    12 votes
    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.
  • The Griffin Equivalency
    19

    The Griffin Equivalency

    October 13, 2008
    11 votes
    Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
  • The White Asparagus Triangulation
    20

    The White Asparagus Triangulation

    November 24, 2008
    13 votes
    Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
  • The Maternal Capacitance
    21

    The Maternal Capacitance

    February 09, 2009
    15 votes
    Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
  • The Cooper-Nowitzki Theorem
    22

    The Cooper-Nowitzki Theorem

    November 03, 2008
    15 votes
    Sheldon and the gang are confused when a young grad student is attracted to him.
  • The Vartabedian Conundrum
    23

    The Vartabedian Conundrum

    December 08, 2008
    14 votes
    Leonard asks Penny for advice when his new relationship starts moving too fast.