1. The Electric Can Opener Fluctuation
When Sheldon learns the guys tampered with his expedition data he got from the arctic, he leaves to Texas in disgrace. This results in the guys following him, which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon.
2. The Jiminy Conjecture
Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket.
3. The Gothowitz Deviation
Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
Released: 10/5/2009
Directors:
Mark Cendrowski4. The Pirate Solution
Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as a third wheel.
5. The Creepy Candy Coating Corollary
After overhearing that Wil Wheaton is entering a trading-card competition, Sheldon decides to enter it himself. Meanwhile, Penny sets up one of her friends on a date with Wolowitz.
Released: 10/19/2009
Directors:
Mark Cendrowski6. The Cornhusker Vortex
Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.
Released: 11/2/2009
Directors:
Mark Cendrowski7. The Guitarist Amplification
A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
Released: 11/9/2009
Directors:
Mark Cendrowski8. The Adhesive Duck Deficiency
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
Released: 11/16/2009
Directors:
Mark Cendrowski9. The Vengeance Formulation
After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
Released: 11/23/2009
Directors:
Mark Cendrowski10. The Gorilla Experiment
Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
Released: 12/7/2009
Directors:
Mark Cendrowski11. The Maternal Congruence
A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.
Released: 12/14/2009
Directors:
Mark Cendrowski12. The Psychic Vortex
Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university mixer.
Released: 1/11/2010
Directors:
Mark Cendrowski13. The Bozeman Reaction
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
Released: 1/18/2010
Directors:
Mark Cendrowski14. The Einstein Approximation
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
Released: 2/1/2010
Directors:
Mark Cendrowski15. The Large Hadron Collision
Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.
Released: 2/8/2010
Directors:
Mark Cendrowski16. The Excelsior Acquisition
Sheldon winds up in traffic court when he gets a ticket because of Penny.
Released: 3/1/2010
Directors:
Peter Chakos17. The Precious Fragmentation
When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
Released: 3/8/2010
Directors:
Mark Cendrowski18. The Pants Alternative
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
Released: 3/22/2010
Directors:
Mark Cendrowski19. The Wheaton Recurrence
A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
Released: 4/12/2010
Directors:
Mark Cendrowski20. The Spaghetti Catalyst
When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
Released: 5/3/2010
Directors:
Anthony Joseph Rich21. The Plimpton Stimulation
Leonard and Sheldon compete for the attention of a famous female physicist.
Released: 5/10/2010
Directors:
Mark Cendrowski22. The Staircase Implementation
Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
Released: 5/17/2010
Directors:
Mark Cendrowski23. The Lunar Excitation
While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.
Released: 5/24/2010
Directors:
Peter Chakos