Air date: 2007-09-24

Runtime: 23 min

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.

Air date: 2007-10-01

Runtime: 21 min

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.

Air date: 2007-10-08

Runtime: 22 min

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

Air date: 2007-10-15

Runtime: 21 min

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.

Air date: 2007-10-22

Runtime: 20 min

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

Air date: 2007-10-29

Runtime: 21 min

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

Air date: 2007-11-05

Runtime: 21 min

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

Air date: 2007-11-12

Runtime: 20 min

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.

Air date: 2008-03-17

Runtime: 19 min

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.

Air date: 2008-03-24

Runtime: 21 min

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

Air date: 2008-03-31

Runtime: 22 min

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.

Air date: 2008-04-14

Runtime: 20 min

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.

Air date: 2008-04-21

Runtime: 22 min

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.

Air date: 2008-04-28

Runtime: 20 min

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.

Air date: 2008-05-05

Runtime: 22 min

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.

Air date: 2008-05-12

Runtime: 20 min

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

Air date: 2008-05-19

Runtime: 20 min

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.