The Big Bang Theory

• 
  E1

  Pilot

  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.

  2007-09-24 · 23m
  Mark watched
• 
  E2

  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.

  2007-10-01 · 21m
  Mark watched
• 
  E3

  The Fuzzy Boots Corollary

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

  2007-10-08 · 22m
  Mark watched
• 
  E4

  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.

  2007-10-15 · 21m
  Mark watched
• 
  E5

  The Hamburger Postulate

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

  2007-10-22 · 20m
  Mark watched
• 
  E6

  The Middle-Earth Paradigm

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

  2007-10-29 · 21m
  Mark watched
• 
  E7

  The Dumpling Paradox

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

  2007-11-05 · 21m
  Mark watched
• 
  E8

  The Grasshopper Experiment

  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.

  2007-11-12 · 20m
  Mark watched
• 
  E9

  The Cooper-Hofstadter Polarization

  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.

  2008-03-17 · 19m
  Mark watched
• 
  E10

  The Loobenfeld Decay

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

  2008-03-24 · 21m
  Mark watched
• 
  E11

  The Pancake Batter Anomaly

  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.

  2008-03-31 · 22m
  Mark watched
• 
  E12

  The Jerusalem Duality

  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.

  2008-04-14 · 20m
  Mark watched
• 
  E13

  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.

  2008-04-21 · 22m
  Mark watched
• 
  E14

  The Nerdvana Annihilation

  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.

  2008-04-28 · 20m
  Mark watched
• 
  E15

  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.

  2008-05-05 · 22m
  Mark watched
• 
  E16

  The Peanut Reaction

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

  2008-05-12 · 20m
  Mark watched
• 
  E17

  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 date.

  2008-05-19 · 20m
  Mark watched

Top cast

Johnny Galecki

Leonard Hofstadter

Jim Parsons

Sheldon Cooper

Kaley Cuoco

Penny

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Rajesh Koothrappali

Melissa Rauch

Bernadette Rostenkowski

Mayim Bialik

Amy Farrah Fowler