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.

1. 

   1. The Bad Fish Paradigm

   2008-09-22 · 22m

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

2. 

   2. The Codpiece Topology

   2008-09-29 · 21m

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

3. 

   3. The Barbarian Sublimation

   2008-10-06 · 21m

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

4. 

   4. The Griffin Equivalency

   2008-10-13 · 21m

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

5. 

   5. The Euclid Alternative

   2008-10-20 · 20m

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

6. 

   6. The Cooper-Nowitzki Theorem

   2008-11-03 · 21m

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

7. 

   7. The Panty Piñata Polarization

   2008-11-10 · 21m

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

8. 

   8. The Lizard-Spock Expansion

   2008-11-17 · 20m

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

9. 

   9. The White Asparagus Triangulation

   2008-11-24 · 21m

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

10. 

    10. The Vartabedian Conundrum

    2008-12-08 · 21m

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

11. 

    11. The Bath Item Gift Hypothesis

    2008-12-15 · 21m

    Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

12. 

    12. The Killer Robot Instability

    2009-01-12 · 21m

    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. 

    13. The Friendship Algorithm

    2009-01-19 · 21m

    Sheldon creates a scientific procedure for making friends.

14. 

    14. The Financial Permeability

    2009-02-02 · 21m

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

15. 

    15. The Maternal Capacitance

    2009-02-09 · 21m

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

16. 

    16. The Cushion Saturation

    2009-03-02 · 21m

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

17. 

    17. The Terminator Decoupling

    2009-03-09 · 21m

    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. 

    18. The Work Song Nanocluster

    2009-03-16 · 20m

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

19. 

    19. The Dead Hooker Juxtaposition

    2009-03-30 · 20m

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

20. 

    20. The Hofstadter Isotope

    2009-04-13 · 20m

    A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

21. 

    21. The Vegas Renormalization

    2009-04-27 · 22m

    Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.

22. 

    22. The Classified Materials Turbulence

    2009-05-04 · 19m

    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. 

    23. The Monopolar Expedition

    2009-05-11 · 21m

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