The Big Bang Theory

E1

1. Pilot

24 Sep 2007 · 23m

Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.

E2

2. The Big Bran Hypothesis

1 Oct 2007 · 21m

Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.

E3

3. The Fuzzy Boots Corollary

8 Oct 2007 · 22m

Leonard asks a woman out after he finds out that Penny is seeing someone.

E4

4. The Luminous Fish Effect

15 Oct 2007 · 21m

Sheldon's getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

E5

5. The Hamburger Postulate

22 Oct 2007 · 20m

Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.

E6

6. The Middle-Earth Paradigm

29 Oct 2007 · 21m

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.

E7

7. The Dumpling Paradox

5 Nov 2007 · 21m

With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team

E8

8. The Grasshopper Experiment

12 Nov 2007 · 20m

Raj's parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.

E9

9. The Cooper-Hofstadter Polarization

17 Mar 2008 · 19m

When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation.

E10

10. The Loobenfeld Decay

24 Mar 2008 · 21m

Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.

E11

11. The Pancake Batter Anomaly

31 Mar 2008 · 22m

With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed by Penny, who hasn't a clue what she's in for.

E12

12. The Jerusalem Duality

14 Apr 2008 · 20m

With Sheldon rattled over meeting Dennis, a 15-year-old physicist who's smarter than he, Leonard helps him look for a way to debunk Dennis's research.

E13

13. The Bat Jar Conjecture

21 Apr 2008 · 22m

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he's superior.

E14

14. The Nerdvana Annihilation

28 Apr 2008 · 20m

When delivery of another collectible leads to Penny's lashing out at Leonard, he decides it's time to give up his habit, much to his friends' protestation.

E15

15. The Pork Chop Indeterminacy

5 May 2008 · 22m

The rest of the gang fall for Sheldon's twin sister, and Leonard's plan to win her heart is derailed when Sheldon declares he'll be the one to decide who can date her.

E16

16. The Peanut Reaction

12 May 2008 · 20m

Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.

E17

17. The Tangerine Factor

19 May 2008 · 20m

Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.