Season 2
Episodes • 2008

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