Seasons & episodes
S2 · E1The Bad Fish Paradigm 8.0 / 10 · 1 published rating 2008-09-22 · 22 min
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
S2 · E2The Codpiece Topology 7.9 / 10 · 1 published rating 2008-09-29 · 21 min
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
S2 · E3The Barbarian Sublimation 8.0 / 10 · 1 published rating 2008-10-06 · 21 min
Sheldon creates a monster when he introduces Penny to online gaming.
S2 · E4The Griffin Equivalency 8.8 / 10 · 1 published rating 2008-10-13 · 21 min
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S2 · E5The Euclid Alternative 8.1 / 10 · 1 published rating 2008-10-20 · 20 min
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S2 · E6The Cooper-Nowitzki Theorem 8.0 / 10 · 1 published rating 2008-11-03 · 21 min
Sheldon and the gang are confused when a young grad student is attracted to him.
S2 · E7The Panty Piñata Polarization 8.8 / 10 · 1 published rating 2008-11-10 · 21 min
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
S2 · E8The Lizard-Spock Expansion 8.4 / 10 · 1 published rating 2008-11-17 · 20 min
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
S2 · E9The White Asparagus Triangulation 7.7 / 10 · 1 published rating 2008-11-24 · 21 min
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
S2 · E10The Vartabedian Conundrum 7.3 / 10 · 1 published rating 2008-12-08 · 21 min
Leonard asks Penny for advice when his new relationship starts moving too fast.
S2 · E11The Bath Item Gift Hypothesis 8.9 / 10 · 1 published rating 2008-12-15 · 21 min
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
S2 · E12The Killer Robot Instability 8.9 / 10 · 1 published rating 2009-01-12 · 21 min
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 · E13The Friendship Algorithm 8.0 / 10 · 1 published rating 2009-01-19 · 21 min
Sheldon creates a scientific procedure for making friends.
S2 · E14The Financial Permeability 8.9 / 10 · 1 published rating 2009-02-02 · 21 min
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
S2 · E15The Maternal Capacitance 8.5 / 10 · 1 published rating 2009-02-09 · 21 min
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
S2 · E16The Cushion Saturation 7.8 / 10 · 1 published rating 2009-03-02 · 21 min
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S2 · E17The Terminator Decoupling 8.5 / 10 · 1 published rating 2009-03-09 · 21 min
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 · E18The Work Song Nanocluster 8.5 / 10 · 1 published rating 2009-03-16 · 20 min
Penny's home business turns into a complete nightmare when Sheldon takes over.
S2 · E19The Dead Hooker Juxtaposition 7.9 / 10 · 1 published rating 2009-03-30 · 20 min
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
S2 · E20The Hofstadter Isotope 8.0 / 10 · 1 published rating 2009-04-13 · 20 min
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
S2 · E21The Vegas Renormalization 7.9 / 10 · 1 published rating 2009-04-27 · 22 min
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
S2 · E22The Classified Materials Turbulence 8.4 / 10 · 1 published rating 2009-05-04 · 19 min
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 · E23The Monopolar Expedition 8.8 / 10 · 1 published rating 2009-05-11 · 21 min
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.