Title Airs On

S2:E1 The Bad Fish Paradigm

The Big Bang Theory
09/22/2008 10:27 am EDT

Leonard becomes concerned when his date with Penny ends abruptly and she starts blowing him off. When told the truth, Sheldon ...read more Leonard becomes concerned when his date with Penny ends abruptly and she starts blowing him off. When told the truth, Sheldon would rather move out than keep Penny's reasons a secret from Leonard. show less

S2:E2 The Codpiece Topology

The Big Bang Theory
09/29/2008 10:28 am EDT

Sheldon is annoyed when Leonard turns to Leslie for comfort after seeing Penny with another guy.

S2:E3 The Barbarian Sublimation

The Big Bang Theory
10/06/2008 10:29 am EDT

Sheldon introduces Penny to online gaming, however she refuses to quit after becoming addicted.

S2:E4 The Griffin Equivalency

The Big Bang Theory
10/13/2008 10:30 am EDT

The guys struggle to cope with Raj's arrogance after he is featured in a People magazine article.

S2:E5 The Euclid Alternative

The Big Bang Theory
10/20/2008 10:30 am EDT

Sheldon annoys the gang when Leonard can't drive him to and from work, so they try to teach him how to drive.

S2:E6 The Cooper-Nowitzki Theorem

The Big Bang Theory
11/03/2008 10:31 am EST

Sheldon is flattered when a graduate student takes a shine to him, however her extreme devotion becomes too much to handle.

S2:E7 The Panty Pinata Polarization

The Big Bang Theory
11/10/2008 10:34 am EST

Penny plans revenge when Sheldon bans her from his and Leonard's apartment, while Howard and Raj use the latest technology ...read more Penny plans revenge when Sheldon bans her from his and Leonard's apartment, while Howard and Raj use the latest technology to try to find the house being used in "America's Next Top Model." show less

S2:E8 The Lizard-Spock Expansion

The Big Bang Theory
11/17/2008 10:32 am EST

Leonard and Howard's friendship is jeopardised when Leonard steals a girl from Howard.

S2:E9 The White Asparagus Triangulation

The Big Bang Theory
11/24/2008 10:35 am EST

Sheldon believes that Leonard will wreck his relationship with Stephanie, so he decides to take matters into his own hands.

S2:E10 The Vartabedian Conundrum

The Big Bang Theory
12/08/2008 10:35 am EST

Leonard tries to slow down his relationship with Stephanie when he realizes that they are living together, while Sheldon becomes ...read more Leonard tries to slow down his relationship with Stephanie when he realizes that they are living together, while Sheldon becomes convinced that he has an untraceable disease. show less

S2:E11 The Bath Item Gift Hypothesis

The Big Bang Theory
12/15/2008 10:36 am EST

Leonard is disappointed when Penny develops an interest in an attractive physicist at the university. Meanwhile, Sheldon ...read more Leonard is disappointed when Penny develops an interest in an attractive physicist at the university. Meanwhile, Sheldon struggles to find an appropriate Christmas gift for Penny. show less

S2:E12 The Killer Robot Instability

The Big Bang Theory
01/12/2009 10:37 am EST

Howard becomes depressed after Penny makes a cruel statement about his love life, while the rest of the guys prepare for a ...read more Howard becomes depressed after Penny makes a cruel statement about his love life, while the rest of the guys prepare for a grudge killer robot duel against an obnoxious colleague at the university. show less

S2:E13 The Friendship Algorithm

The Big Bang Theory
01/19/2009 10:38 am EST

Sheldon triesto make friends with Kripke in the hope that it will get him access to a coveted computer at the university.

S2:E14 The Financial Permeability

The Big Bang Theory
03/02/2009 10:38 am EST

Leonard and Sheldon try to help out Penny when she can't afford to pay her rent.

S2:E15 The Maternal Capacitance

The Big Bang Theory
02/09/2009 10:39 am EST

Sheldon hits it off with Leonard's psychoanalyst mother, but she drives Leonard and Penny to the bottle.

S2:E16 The Cushion Saturation

The Big Bang Theory
05/02/2009 10:39 am EDT

Howard hooks up with Leslie, while Penny accidentally ruins Sheldon's spot on the couch.

S2:E17 The Terminator Decoupling

The Big Bang Theory
03/09/2009 10:40 am EDT

On a train to San Francisco, Howard, Raj and Leonard fight for the affections of sci-fi star Summer Glau, while Sheldon is ...read more On a train to San Francisco, Howard, Raj and Leonard fight for the affections of sci-fi star Summer Glau, while Sheldon is forced to turn to Penny for help when he leaves his flash drive behind. show less

S2:E18 The Work Song Nanocluster

The Big Bang Theory
03/16/2009 10:40 am EDT

Sheldon's assistance with Penny's home-based business leads to disaster.

S2:E19 The Dead Hooker Juxtaposition

The Big Bang Theory
03/30/2009 10:41 am EDT

Penny becomes jealous when a gorgeous new neighbor attracts the guys' attention.

S2:E20 The Hofstadter Isotope

The Big Bang Theory
04/13/2009 10:41 am EDT

Leonard is so upset when a friend from the comic book store begins dating Penny that he convinces Howard and Raj to take him to ...read more Leonard is so upset when a friend from the comic book store begins dating Penny that he convinces Howard and Raj to take him to a bar so that he can pick up a woman of his own. show less

S2:E21 The Vegas Renormalization

The Big Bang Theory
04/17/2009 10:42 am EDT

After being dumped by Leslie, Howard heads to Las Vegas with Leonard and Raj. Meanwhile, Penny is forced to take in Sheldon ...read more After being dumped by Leslie, Howard heads to Las Vegas with Leonard and Raj. Meanwhile, Penny is forced to take in Sheldon after he locks himself out of his apartment. show less

S2:E22 The Classified Materials Turbulence

The Big Bang Theory
05/04/2009 10:43 am EDT

Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his ...read more Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his NASA projects. show less

S2:E23 The Monopolar Expedition

The Big Bang Theory
05/11/2009 12:41 pm EDT

Penny gets upset when she finds out Leonard and the guys plan to work at the North Pole for the summer.