Season 2 Episodes

Episode Guide

The Monopolar Expedition

Season 2, Episode 23 - Air Date: 5/8/2009
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Episode Guide

The Classified Materials Turbulence

Season 2, Episode 22 - Air Date: 5/4/2009
Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her.
Episode Guide

The Vegas Renormalization

Season 2, Episode 21 - Air Date: 4/26/2009
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Episode Guide

The Hofstadter Isotope

Season 2, Episode 20 - Air Date: 4/13/2009
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Episode Guide

The Dead Hooker Juxtaposition

Season 2, Episode 19 - Air Date: 3/30/2009
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Episode Guide

The Work Song Nanocluster

Season 2, Episode 18 - Air Date: 3/16/2009
Penny's home business turns into a complete nightmare when Sheldon takes over.
Episode Guide

The Terminator Decoupling

Season 2, Episode 17 - Air Date: 3/5/2009
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.
Episode Guide

The Cushion Saturation

Season 2, Episode 16 - Air Date: 3/2/2009
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
Episode Guide

The Maternal Capacitance

Season 2, Episode 15 - Air Date: 2/9/2009
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
Episode Guide

The Financial Permeability

Season 2, Episode 14 - Air Date: 2/2/2009
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
Episode Guide

The Friendship Algorithm

Season 2, Episode 13 - Air Date: 1/20/2009
Sheldon creates a scientific procedure for making friends.
Episode Guide

The Killer Robot Instability

Season 2, Episode 12 - Air Date: 1/12/2009
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.
Episode Guide

The Bath Item Gift Hypothesis

Season 2, Episode 11 - Air Date: 12/15/2008
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
Episode Guide

The Vartabedian Conundrum

Season 2, Episode 10 - Air Date: 12/8/2008
Leonard asks Penny for advice when his new relationship starts moving too fast.
Episode Guide

The White Asparagus Triangulation

Season 2, Episode 9 - Air Date: 11/24/2008
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
Episode Guide

The Lizard-Spock Expansion

Season 2, Episode 8 - Air Date: 11/17/2008
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
Episode Guide

The Panty Piñata Polarization

Season 2, Episode 7 - Air Date: 10/10/2008
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
Episode Guide

The Cooper-Nowitzki Theorem

Season 2, Episode 6 - Air Date: 11/3/2008
Sheldon and the gang are confused when a young grad student is attracted to him.
Episode Guide

The Euclid Alternative

Season 2, Episode 5 - Air Date: 10/20/2008
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Episode Guide

The Griffin Equivalency

Season 2, Episode 4 - Air Date: 10/13/2008
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
Episode Guide

The Barbarian Sublimation

Season 2, Episode 3 - Air Date: 10/6/2008
Sheldon creates a monster when he introduces Penny to online gaming.
Episode Guide

The Codpiece Topology

Season 2, Episode 2 - Air Date: 9/29/2008
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
Episode Guide

The Bad Fish Paradigm

Season 2, Episode 1 - Air Date: 9/22/2008
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.