Season 2 Episodes
Episodes
1. The Bad Fish Paradigm
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
2. The Codpiece Topology
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
3. The Barbarian Sublimation
Sheldon creates a monster when he introduces Penny to online gaming.
4. The Griffin Equivalency
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
5. The Euclid Alternative
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
6. The Cooper-Nowitzki Theorem
Sheldon and the gang are confused when a young grad student is attracted to him.
7. The Panty Piñata Polarization
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
8. The Lizard-Spock Expansion
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
9. The White Asparagus Triangulation
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
10. The Vartabedian Conundrum
Leonard asks Penny for advice when his new relationship starts moving too fast.
11. 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.
12. 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.
13. The Friendship Algorithm
Sheldon creates a scientific procedure for making friends.
14. The Financial Permeability
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
15. The Maternal Capacitance
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
16. The Cushion Saturation
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
17. 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.
18. The Work Song Nanocluster
Penny's home business turns into a complete nightmare when Sheldon takes over.
19. The Dead Hooker Juxtaposition
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
20. The Hofstadter Isotope
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
21. 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.
22. 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.
23. The Monopolar Expedition
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
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Season 2
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.