Seasons & episodes
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.
S3 · E1The Electric Can Opener Fluctuation 8.0 / 10 · 1 published rating 2009-09-21 · 22 min
When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.
S3 · E2The Jiminy Conjecture 8.6 / 10 · 1 published rating 2009-09-28 · 21 min
Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.
S3 · E3The Gothowitz Deviation 8.7 / 10 · 1 published rating 2009-10-05 · 20 min
Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
S3 · E4The Pirate Solution 8.8 / 10 · 1 published rating 2009-10-12 · 21 min
Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as a third wheel.
S3 · E5The Creepy Candy Coating Corollary 9.4 / 10 · 1 published rating 2009-10-19 · 21 min
After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.