Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
22min
September 22, 2008
2. The Codpiece Topology
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
21min
September 29, 2008
3. The Barbarian Sublimation
Sheldon creates a monster when he introduces Penny to online gaming.
21min
October 6, 2008
4. The Griffin Equivalency
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
21min
October 13, 2008
5. The Euclid Alternative
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
20min
October 20, 2008
6. The Cooper-Nowitzki Theorem
Sheldon and the gang are confused when a young grad student is attracted to him.
21min
November 3, 2008
7. The Panty Piñata Polarization
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
21min
November 10, 2008
8. The Lizard-Spock Expansion
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
20min
November 17, 2008
9. The White Asparagus Triangulation
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
21min
November 24, 2008
10. The Vartabedian Conundrum
Leonard asks Penny for advice when his new relationship starts moving too fast.
21min
December 8, 2008
11. The Bath Item Gift Hypothesis
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
21min
December 15, 2008
12. The Killer Robot Instability
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.
21min
January 12, 2009
13. The Friendship Algorithm
Sheldon creates a scientific procedure for making friends.
21min
January 19, 2009
14. The Financial Permeability
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
21min
February 2, 2009
15. The Maternal Capacitance
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
21min
February 9, 2009
16. The Cushion Saturation
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
21min
March 2, 2009
17. The Terminator Decoupling
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.
21min
March 9, 2009
18. The Work Song Nanocluster
Penny's home business turns into a complete nightmare when Sheldon takes over.
20min
March 16, 2009
19. The Dead Hooker Juxtaposition
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
20min
March 30, 2009
20. The Hofstadter Isotope
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
20min
April 13, 2009
21. The Vegas Renormalization
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
22min
April 27, 2009
22. The Classified Materials Turbulence
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.
19min
May 4, 2009
23. The Monopolar Expedition
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.