Episodes
Pilot
7.4Brilliant 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.
23 min
The Big Bran Hypothesis
7.4Leonard 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.
21 min
The Fuzzy Boots Corollary
7.1Leonard asks a woman out after he finds out that Penny is seeing someone.
22 min
The Luminous Fish Effect
7.5Sheldon'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.
21 min
The Hamburger Postulate
7.5Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
20 min
The Middle-Earth Paradigm
7.5Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
21 min
The Dumpling Paradox
7.8With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team
21 min
The Grasshopper Experiment
7.4Raj's parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.
20 min
The Cooper-Hofstadter Polarization
7.6When 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.
19 min
The Loobenfeld Decay
7.4Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.
21 min
The Pancake Batter Anomaly
7.7With 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.
22 min
The Jerusalem Duality
7.2With 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.
20 min
The Bat Jar Conjecture
7.7Sheldon 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.
22 min
The Nerdvana Annihilation
7.4When 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.
20 min
The Pork Chop Indeterminacy
7.5The 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.
22 min
The Peanut Reaction
7.5Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
20 min
The Tangerine Factor
7.8Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.
20 min