Season 2
Episodes
S2 · E1 · 22 Sept 2008 · 22 min
The Bad Fish Paradigm
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
S2 · E2 · 29 Sept 2008 · 21 min
The Codpiece Topology
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
S2 · E3 · 6 Oct 2008 · 21 min
The Barbarian Sublimation
Sheldon creates a monster when he introduces Penny to online gaming.
S2 · E4 · 13 Oct 2008 · 21 min
The Griffin Equivalency
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S2 · E5 · 20 Oct 2008 · 20 min
The Euclid Alternative
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S2 · E6 · 3 Nov 2008 · 21 min
The Cooper-Nowitzki Theorem
Sheldon and the gang are confused when a young grad student is attracted to him.
S2 · E7 · 10 Nov 2008 · 21 min
The Panty Piñata Polarization
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
S2 · E8 · 17 Nov 2008 · 20 min
The Lizard-Spock Expansion
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
S2 · E9 · 24 Nov 2008 · 21 min
The White Asparagus Triangulation
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
S2 · E10 · 8 Dec 2008 · 21 min
The Vartabedian Conundrum
Leonard asks Penny for advice when his new relationship starts moving too fast.
S2 · E11 · 15 Dec 2008 · 21 min
The Bath Item Gift Hypothesis
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
S2 · E12 · 12 Jan 2009 · 21 min
The Killer Robot Instability
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.
S2 · E13 · 19 Jan 2009 · 21 min
The Friendship Algorithm
Sheldon creates a scientific procedure for making friends.
S2 · E14 · 2 Feb 2009 · 21 min
The Financial Permeability
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
S2 · E15 · 9 Feb 2009 · 21 min
The Maternal Capacitance
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
S2 · E16 · 2 Mar 2009 · 21 min
The Cushion Saturation
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S2 · E17 · 9 Mar 2009 · 21 min
The Terminator Decoupling
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.
S2 · E18 · 16 Mar 2009 · 20 min
The Work Song Nanocluster
Penny's home business turns into a complete nightmare when Sheldon takes over.
S2 · E19 · 30 Mar 2009 · 20 min
The Dead Hooker Juxtaposition
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
S2 · E20 · 13 Apr 2009 · 20 min
The Hofstadter Isotope
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
S2 · E21 · 27 Apr 2009 · 22 min
The Vegas Renormalization
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
S2 · E22 · 4 May 2009 · 19 min
The Classified Materials Turbulence
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.
S2 · E23 · 11 May 2009 · 21 min
The Monopolar Expedition
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Data and images from TMDB.