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Pilot

Episode number: 1

Overview: 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.

The Big Bran Hypothesis

Episode number: 2

Overview: 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.

The Fuzzy Boots Corollary

Episode number: 3

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

The Luminous Fish Effect

Episode number: 4

Overview: 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.

The Hamburger Postulate

Episode number: 5

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

The Middle-Earth Paradigm

Episode number: 6

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

The Dumpling Paradox

Episode number: 7

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

The Grasshopper Experiment

Episode number: 8

Overview: 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.

The Cooper-Hofstadter Polarization

Episode number: 9

Overview: 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.

The Loobenfeld Decay

Episode number: 10

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

The Pancake Batter Anomaly

Episode number: 11

Overview: 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.

The Jerusalem Duality

Episode number: 12

Overview: 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.

The Bat Jar Conjecture

Episode number: 13

Overview: 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.

The Nerdvana Annihilation

Episode number: 14

Overview: 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.

The Pork Chop Indeterminacy

Episode number: 15

Overview: 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.

The Peanut Reaction

Episode number: 16

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

The Tangerine Factor

Episode number: 17

Overview: 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.