The Big Bang Theory - Season 2

First aired: 9/22/2008 23 episodes

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.

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Episodes

1. The Bad Fish Paradigm

Aired: 9/22/2008

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

2. The Codpiece Topology

Aired: 9/29/2008

A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

3. The Barbarian Sublimation

Aired: 10/6/2008

Sheldon creates a monster when he introduces Penny to online gaming.

4. The Griffin Equivalency

Aired: 10/13/2008

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

5. The Euclid Alternative

Aired: 10/20/2008

Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

6. The Cooper-Nowitzki Theorem

Aired: 11/3/2008

Sheldon and the gang are confused when a young grad student is attracted to him.

7. The Panty Piñata Polarization

Aired: 11/10/2008

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.

8. The Lizard-Spock Expansion

Aired: 11/17/2008

Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

9. The White Asparagus Triangulation

Aired: 11/24/2008

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

10. The Vartabedian Conundrum

Aired: 12/8/2008

Leonard asks Penny for advice when his new relationship starts moving too fast.

11. The Bath Item Gift Hypothesis

Aired: 12/15/2008

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

Aired: 1/12/2009

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

Aired: 1/19/2009

Sheldon creates a scientific procedure for making friends.

14. The Financial Permeability

Aired: 2/2/2009

Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

15. The Maternal Capacitance

Aired: 2/9/2009

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

16. The Cushion Saturation

Aired: 3/2/2009

A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

17. The Terminator Decoupling

Aired: 3/9/2009

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

Aired: 3/16/2009

Penny's home business turns into a complete nightmare when Sheldon takes over.

19. The Dead Hooker Juxtaposition

Aired: 3/30/2009

Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

20. The Hofstadter Isotope

Aired: 4/13/2009

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

Aired: 4/27/2009

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

Aired: 5/4/2009

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

Aired: 5/11/2009

The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.