Season 1

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  8.1/108,142 votes

  Pilot

  Season 1 Episode 1 - Aired 9/24/2007

  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.

  Director: James Burrows

  Writer: Chuck Lorre, Bill Prady

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  8.2/106,547 votes

  The Big Bran Hypothesis

  Season 1 Episode 2 - Aired 10/1/2007

  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.

  Director: Mark Cendrowski

  Writer: Unknown

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  7.6/105,883 votes

  The Fuzzy Boots Corollary

  Season 1 Episode 3 - Aired 10/8/2007

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

  Director: Mark Cendrowski

  Writer: Unknown

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  8.0/105,926 votes

  The Luminous Fish Effect

  Season 1 Episode 4 - Aired 10/15/2007

  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.

  Director: Bob Koherr, Mark Cendrowski

  Writer: Unknown

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  7.8/105,630 votes

  The Hamburger Postulate

  Season 1 Episode 5 - Aired 10/22/2007

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

  Director: Andrew D. Weyman

  Writer: Unknown

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  8.3/105,850 votes

  The Middle-Earth Paradigm

  Season 1 Episode 6 - Aired 10/29/2007

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

  Director: Mark Cendrowski

  Writer: Unknown

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  8.0/105,545 votes

  The Dumpling Paradox

  Season 1 Episode 7 - Aired 11/5/2007

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

  Director: Mark Cendrowski

  Writer: Unknown

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  8.1/105,559 votes

  The Grasshopper Experiment

  Season 1 Episode 8 - Aired 11/12/2007

  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.

  Director: Ted Wass

  Writer: Unknown

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  7.9/105,363 votes

  The Cooper-Hofstadter Polarization

  Season 1 Episode 9 - Aired 3/17/2008

  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.

  Director: Joel Murray

  Writer: Unknown

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  8.0/105,492 votes

  The Loobenfeld Decay

  Season 1 Episode 10 - Aired 3/24/2008

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

  Director: Mark Cendrowski

  Writer: Unknown

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  8.2/105,467 votes

  The Pancake Batter Anomaly

  Season 1 Episode 11 - Aired 3/31/2008

  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.

  Director: Mark Cendrowski

  Writer: Unknown

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  7.8/105,189 votes

  The Jerusalem Duality

  Season 1 Episode 12 - Aired 4/14/2008

  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.

  Director: Mark Cendrowski

  Writer: Unknown

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  8.2/105,352 votes

  The Bat Jar Conjecture

  Season 1 Episode 13 - Aired 4/21/2008

  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.

  Director: Mark Cendrowski

  Writer: Unknown

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  8.0/105,247 votes

  The Nerdvana Annihilation

  Season 1 Episode 14 - Aired 4/28/2008

  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.

  Director: Mark Cendrowski

  Writer: Unknown

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  8.2/105,499 votes

  The Pork Chop Indeterminacy

  Season 1 Episode 15 - Aired 5/5/2008

  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.

  Director: Mark Cendrowski

  Writer: Unknown

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  8.3/105,167 votes

  The Peanut Reaction

  Season 1 Episode 16 - Aired 5/12/2008

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

  Director: Mark Cendrowski

  Writer: Unknown

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  8.5/105,416 votes

  The Tangerine Factor

  Season 1 Episode 17 - Aired 5/19/2008

  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.

  Director: Mark Cendrowski

  Writer: Unknown