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
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
Leonard asks a woman out after he finds out that Penny is seeing
The Luminous Fish Effect
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
Fearing he's wasting his time on Penny, Leonard ends up making a
connection with Leslie. Meanwhile, Sheldon frets over a change
to his hamburger routine.
The Middle Earth Paradigm
Penny hosts a Halloween party, putting Leonard, Sheldon,
Wolowitz, and Koothrappali through a new test of their social
The Dumpling Paradox
With Wolowitz AWOL with one of her friends, Penny's
recruited to fill in for him on the guys' Halo team.
The Grasshopper Experiment
Raj's parents set him up on a blind date, and when he
discovers he can talk to her, she shows interest in Sheldon.
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
The Loobenfeld Decay
Leonard and Sheldon each lie to avoid hearing Penny sing in a
production of Rent. However, Sheldon's lie becomes a bit too
complicated for its own good.
The Pancake Batter Anomaly
With his friends knowing how sour he acts when sick—and
avoiding him as a result—Sheldon is nursed for by Penny, who
hasn't a clue what she's in for.
The Jerusalem Duality
With Sheldon rattled and impossible to be around after
meeting Dennis, a 15-year-old physicist who's smarter than he,
the rest of the guys search for a way to eliminate the threat.
The Bat Jar Conjecture
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
When the delivery of a full-size prop of 1960's The Time
Machine makes Penny miss work, she scolds Leonard about his
sci-fi collectibles. He decides it's time to give up such
The Pork Chop Indeterminacy
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
Penny wants to throw a surprise party for Leonard, but
Sheldon's indulgence at an electronics store throws her
The Tangerine Factor
Penny's break-up spurs Leonard to summon the courage to ask
her out, and each goes to Sheldon for advice on their upcoming