The Big Bang Theory (2007–2019)
22 Sep. 2008The Bad Fish Paradigm
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.
29 Sep. 2008The Codpiece Topology
Sheldon is annoyed when Leonard turns to Leslie for comfort after seeing Penny with another guy.
6 Oct. 2008The Barbarian Sublimation
Sheldon introduces Penny to online gaming, however she refuses to quit after becoming addicted.
13 Oct. 2008The Griffin Equivalency
The guys struggle to cope with Raj's arrogance after he is featured in a People magazine article.
20 Oct. 2008The Euclid Alternative
Sheldon annoys the gang when Leonard can't drive him to and from work, so they try to teach him how to drive.
3 Nov. 2008The Cooper-Nowitzki Theorem
Sheldon is flattered when a graduate student takes a shine to him, however her extreme devotion becomes too much to handle.
10 Nov. 2008The Panty Piñata Polarization
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."
17 Nov. 2008The Lizard-Spock Expansion
Leonard and Howard's friendship is jeopardised when Leonard steals a girl from Howard.
24 Nov. 2008The White Asparagus Triangulation
Sheldon believes that Leonard will wreck his relationship with Stephanie, so he decides to take matters into his own hands.
8 Dec. 2008The Vartabedian Conundrum
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.
15 Dec. 2008The Bath Item Gift Hypothesis
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.
12 Jan. 2009The Killer Robot Instability
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.
19 Jan. 2009The Friendship Algorithm
Sheldon tries to make friends with Kripke in the hope that it will get him access to a coveted computer at the university.
2 Feb. 2009The Financial Permeability
Leonard and Sheldon try to help out Penny when she can't afford to pay her rent.
9 Feb. 2009The Maternal Capacitance
Sheldon hits it off with Leonard's psychoanalyst mother, but she drives Leonard and Penny to the bottle.
2 Mar. 2009The Cushion Saturation
Howard hooks up with Leslie, while Penny accidentally ruins Sheldon's spot on the couch.
9 Mar. 2009The Terminator Decoupling
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.
16 Mar. 2009The Work Song Nanocluster
Sheldon's assistance with Penny's home-based business leads to chaos.
30 Mar. 2009The Dead Hooker Juxtaposition
Penny becomes jealous when a gorgeous new neighbor attracts the guys' attention.
13 Apr. 2009The Hofstadter Isotope
Leonard is upset when the owner of the comic book store goes on a date with Penny, so he convinces Howard and Raj to take him to a bar so that he can pick up a woman of his own.
27 Apr. 2009The Vegas Renormalization
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.
4 May 2009The Classified Materials Turbulence
Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his NASA projects.