• Air date: 22 Sep '08 23 episodes
      At work, physicists Leonard and Sheldon and their geek pals conquer the cosmos. At home, real life - from dating to driving - conquers them. This season, Leonard gets a girl. So does Sheldon. (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. Twenty-three laugh-filled episodes from series creators Chuck Lorre (Two
  • List of Episodes (23)
    • 1. The Bad Fish Paradigm

      22 Sep '08
      Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
    • 2. The Codpiece Topology

      29 Sep '08
      A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
    • 3. The Barbarian Sublimation

      06 Oct '08
      Sheldon creates a monster when he introduces Penny to online gaming.
    • 4. The Griffin Equivalency

      13 Oct '08
      Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
    • 5. The Euclid Alternative

      20 Oct '08
      Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
    • 6. The Cooper-Nowitzki Theorem

      03 Nov '08
      Sheldon and the gang are confused when a young grad student is attracted to him.
    • 7. The Panty Piñata Polarization

      10 Nov '08
      When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
    • 8. The Lizard-Spock Expansion

      17 Nov '08
      Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
    • 9. The White Asparagus Triangulation

      24 Nov '08
      Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
    • 10. The Vartabedian Conundrum

      08 Dec '08
      Leonard asks Penny for advice when his new relationship starts moving too fast.
    • 11. The Bath Item Gift Hypothesis

      15 Dec '08
      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

      12 Jan '09
      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

      19 Jan '09
      Sheldon creates a scientific procedure for making friends.
    • 14. The Financial Permeability

      02 Feb '09
      Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
    • 15. The Maternal Capacitance

      09 Feb '09
      Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
    • 16. The Cushion Saturation

      02 Mar '09
      A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
    • 17. The Terminator Decoupling

      09 Mar '09
      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

      16 Mar '09
      Penny's home business turns into a complete nightmare when Sheldon takes over.
    • 19. The Dead Hooker Juxtaposition

      30 Mar '09
      Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
    • 20. The Hofstadter Isotope

      13 Apr '09
      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

      27 Apr '09
      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

      04 May '09
      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

      11 May '09
      The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.