Season 2 (2008)

The Bad Fish Paradigm
7.8

September 22, 2008 • 22m

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

The Codpiece Topology
7.5

September 29, 2008 • 21m

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

The Barbarian Sublimation
7.8

October 6, 2008 • 21m

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

The Griffin Equivalency
7.5

October 13, 2008 • 21m

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

The Euclid Alternative
7.4

October 20, 2008 • 20m

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

The Cooper-Nowitzki Theorem
7.8

November 3, 2008 • 21m

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

The Panty Piñata Polarization
7.9

November 10, 2008 • 21m

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

The Lizard-Spock Expansion
7.4

November 17, 2008 • 20m

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

The White Asparagus Triangulation
7.4

November 24, 2008 • 21m

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

The Vartabedian Conundrum
7.0

December 8, 2008 • 21m

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

The Bath Item Gift Hypothesis
8.1

December 15, 2008 • 21m

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

The Killer Robot Instability
7.4

January 12, 2009 • 21m

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

The Friendship Algorithm
7.4

January 19, 2009 • 21m

Sheldon creates a scientific procedure for making friends.

The Financial Permeability
7.3

February 2, 2009 • 21m

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

The Maternal Capacitance
8.1

February 9, 2009 • 21m

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

The Cushion Saturation
7.4

March 2, 2009 • 21m

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

The Terminator Decoupling
7.4

March 9, 2009 • 21m

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

The Work Song Nanocluster
7.5

March 16, 2009 • 20m

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

The Dead Hooker Juxtaposition
7.5

March 30, 2009 • 20m

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

The Hofstadter Isotope
7.6

April 13, 2009 • 20m

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

The Vegas Renormalization
7.5

April 27, 2009 • 22m

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

The Classified Materials Turbulence
7.4

May 4, 2009 • 19m

Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realiz...Read more

The Monopolar Expedition
7.5

May 11, 2009 • 21m

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