Episode 1: The Bad Fish Paradigm
2008-09-2222 min
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
Season guide
The Big Bang Theory Season 2 — Episodes and Where to Watch
23 episodes · first aired 2008-09-22
This season, Leonard gets a girl. So does Sheldon. Howard drives the Mars Rover into a ditch. Raj woos a terminator. Gorgeous girl-next-door Penny falls under the spell of Age of Conan. And super-smart, ueberconfident Leslie Winkler reduces mere men to spineless jellyfish.
Episode guide
Episode 2: The Codpiece Topology
2008-09-2921 min
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
Episode 3: The Barbarian Sublimation
2008-10-0621 min
Sheldon creates a monster when he introduces Penny to online gaming.
Episode 4: The Griffin Equivalency
2008-10-1321 min
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
Episode 5: The Euclid Alternative
2008-10-2020 min
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Episode 6: The Cooper-Nowitzki Theorem
2008-11-0321 min
Sheldon and the gang are confused when a young grad student is attracted to him.
Episode 7: The Panty Piñata Polarization
2008-11-1021 min
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
Episode 8: The Lizard-Spock Expansion
2008-11-1720 min
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
Episode 9: The White Asparagus Triangulation
2008-11-2421 min
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
Episode 10: The Vartabedian Conundrum
2008-12-0821 min
Leonard asks Penny for advice when his new relationship starts moving too fast.
Episode 11: The Bath Item Gift Hypothesis
2008-12-1521 min
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
Episode 12: The Killer Robot Instability
2009-01-1221 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.
Episode 13: The Friendship Algorithm
2009-01-1921 min
Sheldon creates a scientific procedure for making friends.
Episode 14: The Financial Permeability
2009-02-0221 min
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
Episode 15: The Maternal Capacitance
2009-02-0921 min
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
Episode 16: The Cushion Saturation
2009-03-0221 min
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
Episode 17: The Terminator Decoupling
2009-03-0921 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.
Episode 18: The Work Song Nanocluster
2009-03-1620 min
Penny's home business turns into a complete nightmare when Sheldon takes over.
Episode 19: The Dead Hooker Juxtaposition
2009-03-3020 min
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Episode 20: The Hofstadter Isotope
2009-04-1320 min
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Episode 21: The Vegas Renormalization
2009-04-2722 min
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Episode 22: The Classified Materials Turbulence
2009-05-0419 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.
Episode 23: The Monopolar Expedition
2009-05-1121 min
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
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