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All Episodes of The Big Bang Theory

Browse all episodes of The Big Bang Theory

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
Genre:Comedy
Network:CBS
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Season 1

  • Pilot
    8.1/107,623 votes
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    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

  • The Big Bran Hypothesis
    8.2/106,132 votes
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    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: N/A

  • The Fuzzy Boots Corollary
    7.6/105,492 votes
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    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: N/A

  • The Luminous Fish Effect
    8.0/105,535 votes
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    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: Mark Cendrowski, Bob Koherr

    Writer: N/A

  • The Hamburger Postulate
    7.8/105,269 votes
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    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: N/A

  • The Middle-Earth Paradigm
    8.3/105,481 votes
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    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: N/A

  • The Dumpling Paradox
    8.1/105,176 votes
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    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: N/A

  • The Grasshopper Experiment
    8.1/105,206 votes
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    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: N/A

  • The Cooper-Hofstadter Polarization
    7.9/105,016 votes
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    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: N/A

  • The Loobenfeld Decay
    8.0/105,135 votes
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    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: N/A

  • The Pancake Batter Anomaly
    8.2/105,116 votes
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    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: N/A

  • The Jerusalem Duality
    7.8/104,838 votes
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    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: N/A

  • The Bat Jar Conjecture
    8.2/104,989 votes
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    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: N/A

  • The Nerdvana Annihilation
    8.0/104,901 votes
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    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: N/A

  • The Pork Chop Indeterminacy
    8.2/105,145 votes
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    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: N/A

  • The Peanut Reaction
    8.3/104,842 votes
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    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: N/A

  • The Tangerine Factor
    8.5/105,077 votes
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    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: N/A