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- Season 2 overviewSep 22, 2008-May 11, 200923 episodesSeason 2 episodes1. The Bad Fish Paradigm Sep 22, 2008
- Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
- 2. The Codpiece Topology Sep 29, 2008
- Leonard rushes into a rebound relationship with Sheldon's nemesis.
- 3. The Barbarian Sublimation Oct 6, 2008
- Sheldon creates a monster when he introduces Penny to online gaming.
- 4. The Griffin Equivalency Oct 13, 2008
- Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
- 5. The Euclid Alternative Oct 20, 2008
- Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
- 6. The Cooper-Nowitzki Theorem Nov 3, 2008
- Sheldon and the gang are confused when a young grad student is attracted to him.
- 7. The Panty Piñata Polarization Nov 10, 2008
- Sheldon bans Penny from the apartment for a series of petty infractions; she vows to get revenge.
- 8. The Lizard-Spock Expansion Nov 17, 2008
- Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
- 9. The White Asparagus Triangulation Nov 24, 2008
- Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
- 10. The Vartabedian Conundrum Dec 8, 2008
- Leonard asks Penny for advice when his new relationship starts moving too fast.
- 11. The Bath Item Gift Hypothesis Dec 15, 2008
- Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
- 12. The Killer Robot Instability Jan 12, 2009
- The guys lose their most important teammate in an upcoming fighting-robot competition.
- 13. The Friendship Algorithm Jan 19, 2009
- Sheldon develops a scientific procedure for making friends; Kripke controls a new supercomputer.
- 14. The Financial Permeability Feb 2, 2009
- Sheldon's solution to Penny's financial difficulty leads to a confrontation.
- 15. The Maternal Capacitance Feb 9, 2009
- Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
- 16. The Cushion Saturation Mar 2, 2009
- A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
- 17. The Terminator Decoupling Mar 9, 2009
- Leonard, Sheldon and Wolowitz are ecstatic to learn that a sci-fi actress is aboard their train.
- 18. The Work Song Nanocluster Mar 16, 2009
- Penny's home business turns into a complete nightmare when Sheldon takes over.
- 19. The Dead Hooker Juxtaposition Mar 30, 2009
- Penny has a rivalry with a new neighbor who threatens her position as queen bee of the building.
- 20. The Hofstadter Isotope Apr 13, 2009
- Wolowitz and Leonard decide to check out a local bar on Ladies' Night.
- 21. The Vegas Renormalization Apr 27, 2009
- Koothrappali and Leonard take Wolowitz to Las Vegas; Sheldon gets locked out of his apartment.
- 22. The Classified Materials Turbulence May 4, 2009
- Penny makes a surprising revelation about Leonard while on her date with Stuart.
- 23. The Monopolar Expedition May 11, 2009
- Leonard and Penny re-evaluate their feelings for each other when he prepares for a three-month trip.
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