Episodes

1. The Bad Fish Paradigm
★ 7.92008-09-22 · 22m
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

2. The Codpiece Topology
★ 7.72008-09-29 · 21m
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

3. The Barbarian Sublimation
★ 7.92008-10-06 · 21m
Sheldon creates a monster when he introduces Penny to online gaming.

4. The Griffin Equivalency
★ 7.62008-10-13 · 21m
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

5. The Euclid Alternative
★ 7.62008-10-20 · 20m
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

6. The Cooper-Nowitzki Theorem
★ 7.82008-11-03 · 21m
Sheldon and the gang are confused when a young grad student is attracted to him.

7. The Panty Piñata Polarization
★ 8.02008-11-10 · 21m
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.

8. The Lizard-Spock Expansion
★ 7.42008-11-17 · 20m
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

9. The White Asparagus Triangulation
★ 7.52008-11-24 · 21m
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

10. The Vartabedian Conundrum
★ 7.02008-12-08 · 21m
Leonard asks Penny for advice when his new relationship starts moving too fast.

11. The Bath Item Gift Hypothesis
★ 8.22008-12-15 · 21m
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

12. The Killer Robot Instability
★ 7.52009-01-12 · 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. The Friendship Algorithm
★ 7.52009-01-19 · 21m
Sheldon creates a scientific procedure for making friends.

14. The Financial Permeability
★ 7.42009-02-02 · 21m
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

15. The Maternal Capacitance
★ 8.12009-02-09 · 21m
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

16. The Cushion Saturation
★ 7.52009-03-02 · 21m
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

17. The Terminator Decoupling
★ 7.62009-03-09 · 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. The Work Song Nanocluster
★ 7.62009-03-16 · 20m
Penny's home business turns into a complete nightmare when Sheldon takes over.

19. The Dead Hooker Juxtaposition
★ 7.62009-03-30 · 20m
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

20. The Hofstadter Isotope
★ 7.62009-04-13 · 20m
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

21. The Vegas Renormalization
★ 7.52009-04-27 · 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. The Classified Materials Turbulence
★ 7.52009-05-04 · 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. The Monopolar Expedition
★ 7.52009-05-11 · 21m
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Where to watch
Availability for United States, provided by JustWatch via TMDB. Links open the provider's own listing.
Cast

Johnny Galecki
Leonard Hofstadter

Jim Parsons
Sheldon Cooper

Kaley Cuoco
Penny

Simon Helberg
Howard Wolowitz

Kunal Nayyar
Rajesh Koothrappali

Melissa Rauch
Bernadette Rostenkowski

Mayim Bialik
Amy Farrah Fowler

















