The Big Bang Theory (Season 1)

Smart is the new sexy.

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.

Pilot 7.3
Air date: 2007-09-24
Runtime: 23 min
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 7.4
Air date: 2007-10-01
Runtime: 21 min
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 7.2
Air date: 2007-10-08
Runtime: 22 min
Overview: Leonard asks a woman out after he finds out that Penny is seeing someone.
The Luminous Fish Effect 7.5
Air date: 2007-10-15
Runtime: 21 min
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 7.5
Air date: 2007-10-22
Runtime: 20 min
Overview: Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
The Middle-Earth Paradigm 7.5
Air date: 2007-10-29
Runtime: 21 min
Overview: Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
The Dumpling Paradox 7.7
Air date: 2007-11-05
Runtime: 21 min
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 7.4
Air date: 2007-11-12
Runtime: 20 min
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 7.6
Air date: 2008-03-17
Runtime: 19 min
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 7.5
Air date: 2008-03-24
Runtime: 21 min
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 7.7
Air date: 2008-03-31
Runtime: 22 min
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 7.1
Air date: 2008-04-14
Runtime: 20 min
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 7.5
Air date: 2008-04-21
Runtime: 22 min
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 7.4
Air date: 2008-04-28
Runtime: 20 min
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 7.4
Air date: 2008-05-05
Runtime: 22 min
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 7.5
Air date: 2008-05-12
Runtime: 20 min
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 7.8
Air date: 2008-05-19
Runtime: 20 min
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.