The Big Bang Theory

Episodes

Season 1 · 17 episodes

• E1 Pilot
  Sep 24, 2007 25 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.

• E2 The Big Bran Hypothesis
  Oct 1, 2007 25 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.

• E3 The Fuzzy Boots Corollary
  Oct 8, 2007 25 min

  When Leonard learns Penny is seeing someone, he decided to asks a nerdy female co-worker out on a date.

• E4 The Luminous Fish Effect
  Oct 15, 2007 25 min

  When Sheldon gets fired and decides to explore life beyond physics, it's up to Leonard to take drastic action to snap his friend out of his funk.

• E5 The Hamburger Postulate
  Oct 22, 2007 25 min

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

• E6 The Middle Earth Paradigm
  Oct 29, 2007 25 min

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

• E7 The Dumpling Paradox
  Nov 5, 2007 25 min

  When Wolowitz seduces one of Penny's friend who then takes over her apartment, Penny sleeps on Leonard and Sheldon's couch. Meanwhile, Penny is recruited to fill in for Howard on the guys' Halo team.

• E8 The Grasshopper Experiment
  Nov 12, 2007 25 min

  Raj's parents set him up on a blind date, but just when he discovers he can talk to his date, she shows interest in Sheldon.

• E9 The Cooper-Hofstadter Polarization
  Mar 17, 2008 25 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.

• E10 The Loobenfeld Decay
  Mar 24, 2008 25 min

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

• E11 The Pancake Batter Anomaly
  Mar 31, 2008 25 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.

• E12 The Jerusalem Duality
  Apr 14, 2008 25 min

  When Sheldon meets a 15-year-old physicist prodigy, he's rattled and threatened and Leonard tries to help him look for ways to debunk his research.

• E13 The Bat Jar Conjecture
  Apr 21, 2008 25 min

  Sheldon finds himself booted from the gang's Physics Bowl team and replaced by Leslie Winkle, so he forms his own team, hoping to prove he's superior.

• E14 The Nerdvana Annihilation
  Apr 28, 2008 25 min

  When the guys buy a time machine prop from a classic 1960 movie, Penny lashes out at Leonard and he decides it's time to give up his habit, much to his friends' protestation.

• E15 The Pork Chop Indeterminacy
  May 5, 2008 25 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.

• E16 The Peanut Reaction
  May 12, 2008 25 min

  Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track. Meanwhile, Howard makes a terrible sacrifice for the sake of the surprise.

• E17 The Tangerine Factor
  May 19, 2008 25 min

  Penny's break-up spurs Leonard to summon up the courage to ask her out, and each head to Sheldon for advice on their upcoming date.