1. Pilot

Brilliant physicists Leonard and Sheldon meet new neighbor Penny, who shows them... More

2. The Big Bran Hypothesis

Leonard volunteers to sign for a package to make a good impression on Penny, but... More

3. The Fuzzy Boots Corollary

Leonard asks a work colleague out after he finds out Penny is seeing someone.

4. The Luminous Fish Effect

Sheldon gets fired and explores what life has to offer outside physics, leaving ... More

5. The Hamburger Postulate

Fearing he's wasting his time on Penny, Leonard makes a connection with Leslie. ... More

6. The Middle Earth Paradigm

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappa... More

7. The Dumpling Paradox

When Wolowitz goes AWOL with one of her friends, Penny's recruited to fill in fo... More

8. The Grasshopper Experiment

Raj's parents set him up on a blind date, and when he discovers he can talk to h... More

9. The Cooper-Hofstadter Polarization

When they're invited to present at a physics conference, Sheldon's reluctance to... More

10. The Loobenfeld Decay

Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent... More

11. The Pancake Batter Anomaly

With his friends knowing how sour he acts when sick and avoiding him as a result... More

12. The Jerusalem Duality

Sheldon is rattled and impossible to be around after meeting Dennis, a 15-year-o... More

13. The Bat Jar Conjecture

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with... More

14. The Nerdvana Annihilation

When the delivery of a full-size prop of 1960's "The Time Machine" causes Penny ... More

15. The Pork Chop Indeterminacy

The gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is ... More

16. The Peanut Reaction

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at a... More

17. The Tangerine Factor

Penny's breakup spurs Leonard to summon the courage to ask her out, and they bot... More