1. The Skank Reflex Analysis

Penny worries that she's screwed things up permanently with her friends after he... More

2. The Infestation Hypothesis

A battle of wills between Sheldon and Penny leaves Amy caught in the middle.

3. The Pulled Groin Extrapolation

Attending a co-worker's wedding, Leonard and Amy (Mayim Bialik) get to know each... More

4. The Wiggly Finger Catalyst

Raj is upset he's the only one of the four guys who's not in a relationship so P... More

5. The Russian Rocket Reaction

Sheldon and Leonard get invited to a housewarming party at Wil Wheaton's house. ... More

6. The Rhinitis Revelation

Sheldon craves attention from his visiting mother.

7. The Good Guy Fluctuation

Sheldon tries to spook his friends on Halloween.

8. The Isolation Permutation

Bernadette and Penny shop for wedding dresses without Amy.

9. The Ornithophobia Diffusion

Sheldon must overcome his fear of birds.

10. The Flaming Spittoon Acquisition

Sheldon becomes jealous when Stuart asks Amy for a date.

11. The Speckerman Recurrence

Leonard comes face-to-face with his high school bully.

12. The Shiny Trinket Maneuver

Sheldon gets in trouble with Amy, and it's up to Penny to teach him how to be a ... More

13. The Recombination Hypothesis

Everything might change when Leonard offers Penny a spur of the moment invitatio... More

14. The Beta Test Initiation

Leonard and Penny "beta test" their relationship.

15. The Friendship Contraction

Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhil... More

16. The Vacation Solution

When Sheldon is forced to take a vacation by the university, he goes to work wit... More

17. The Rothman Disintegration

When a corner office at the University opens up, Sheldon must compete for it wit... More

18. The Werewolf Transformation

A change in Sheldon's routine forces him to re-evaluate his entire life, when hi... More

19. The Weekend Vortex

Sheldon chooses to participate in a guys-only weekend Star Wars gaming marathon ... More

20. The Transporter Malfunction

It's a dream come true for Sheldon when he has a close encounter with his hero, ... More

21. The Hawking Excitation

Sheldon has a chance to meet his hero, Stephen Hawking.

22. The Stag Convergence

Howard's wedding plans are in jeopardy after the guys (and Wil Wheaton) throw hi... More

23. The Launch Acceleration

When NASA reschedules Howard's mission and puts his wedding plans in jeopardy, h... More

24. The Countdown Reflection

When Howard and Bernadette decide they want to be married before his NASA space ... More