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The Big Bang Theory

The Big Bang Theory Season 1 Episode Guide

Monday at 09:31 pm CBS (ch 8)
Season:
  • Pilot

    Episode 1 Originally aired:  September 24, 2007

    When geeky Leonard and Sheldon meet their new neighbor Penny, Leonard is excited about a possible romance, but Sheldon is less enthusiastic feeling his friend is setting himself up for disappointment.

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    Based on 446 ratings
  • The Big Bran Hypothesis

    Episode 2 Originally aired:  October 1, 2007

    Leonard volunteers to sign for a delivery, hoping to make a good impression on Penny. But when he enlists the help of obsessive-compulsive Sheldon, his attempt at chivalry goes horribly awry as Sheldon takes it upon himself to clean her apartment while she sleeps. With Penny infuriated at the intrusion, Leonard tries to make amends.

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    Based on 471 ratings
  • The Fuzzy Boots Corollary

    Episode 3 Originally aired:  October 8, 2007

    Leonard is bummed to learn that his crush, Penny, is seeing someone. Encouraged by his friends and fellow scientists, Leonard actually summons the nerve to ask a nerdy female co-worker out on a date. With that under his belt, he musters the courage to ask Penny out too, but she doesn't realize it is a date.

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    Based on 369 ratings
  • The Luminous Fish Effect

    Episode 4 Originally aired:  October 15, 2007

    Sheldon gets fired and decides to explore life beyond physics. His initial thrill of shopping with Penny devolves over time to him weaving ponchos as a shut-in, forcing Leonard to call on Sheldon's mother.

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    Based on 349 ratings
  • The Hamburger Postulate

    Episode 5 Originally aired:  October 22, 2007

    After sensing his pursuit of Penny isn't going anywhere, Leonard agrees to an unexpected sexual encounter with fellow scientist Leslie Winkle.

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    Based on 354 ratings
  • The Middle Earth Paradigm

    Episode 6 Originally aired:  October 29, 2007

    Leonard, Sheldon, Wolowitz and Koothrappali dress up for the Halloween costume party being thrown by their hot neighbor, Penny.

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    Based on 334 ratings
  • The Dumpling Paradox

    Episode 7 Originally aired:  November 5, 2007

    When Wolowitz seduces Penny's slutty friend who then takes over her apartment, Penny sleeps on Leonard and Sheldon's couch. With Wolowitz preoccupied, the guys discover they are without a fourth member of their group for Halo and in desperation, they ask Penny to join the game.

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    Based on 342 ratings
  • The Grasshopper Experiment

    Episode 8 Originally aired:  November 12, 2007

    Koothrappali is overwhelmed after his parents arrange a blind date, but he discovers he actually can talk to the opposite sex after a few drinks; however, complications set in when his beautiful date is more interested in Sheldon.

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    Based on 309 ratings
  • The Cooper-Hofstadter Polarization

    Episode 9 Originally aired:  March 17, 2008

    Penny tries to mediate when Sheldon and Leonard disagree on whether to present their joint findings at a physics conference.

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    Based on 285 ratings
  • The Cooper-Hofstadter Polarization

    Episode 10 Originally aired:  March 17, 2008

    When Sheldon and Leonard are invited to present their joint findings at a physics conference, Sheldon refuses so Leonard decides to go by himself. Penny steps in to mediate, but only causes a greater rift between the two best friends.

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    Based on 131 ratings
  • The Loobenfeld Decay

    Episode 11 Originally aired:  March 24, 2008

    After hearing Penny sing, Leonard lies to avoid seeing her perform, but Sheldon takes it one step further with a more elaborate lie that leads to the appearance of his non-existent cousin.

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    Based on 177 ratings
  • The Pancake Batter Anomaly

    Episode 12 Originally aired:  March 31, 2008

    When Sheldon gets sick, Leonard and the boys know what's in store and avoid him like the plague, leaving an unsuspecting Penny to nurse the world's worst patient back to health.

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    Based on 171 ratings
  • The Jerusalem Duality

    Episode 13 Originally aired:  April 14, 2008

    When Leonard and Sheldon meet a 15-year-old physics prodigy, Sheldon is distraught that this boy genius is younger and smarter. In an attempt to restore his sense of purpose, the gang comes up with a solution to derail Dennis' research. During his welcoming ceremony they bring in a slew of pretty young girls hoping he will be distracted from his purpose and they succeed beyond their expectations.

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    Based on 159 ratings
  • The Bat Jar Conjecture

    Episode 14 Originally aired:  April 21, 2008

    Since Sheldon's only focus is to prove his mental superiority while preparing for the Physics Bowl, the guys kick him off the team and enlist his nemesis Leslie Winkle.

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    Based on 137 ratings
  • The Nerdvana Annihilation

    Episode 15 Originally aired:  April 28, 2008

    When Leonard and the guys buy a time machine prop from a classic 1960 movie, its arrival creates problems for Penny and she tells the boys that their obsession with comics and toys is "pathetic." Stung by Penny's outburst, Leonard decides to give up his time machine and other geeky pleasures for Penny, only to learn that she has a date.

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    Based on 134 ratings
  • The Shiksa Indeterminacy

    Episode 16 Originally aired:  May 5, 2008

    When Leonard, Wolowitz, and Koothrappali all become smitten with Sheldon's beautiful twin sister, Leonard devises a plan to eliminate his rivals. However, it backfires when Sheldon declares he will decide whom his sister dates.

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    Based on 138 ratings
  • The Peanut Reaction

    Episode 17 Originally aired:  May 12, 2008

    Penny learns that it's Leonard's birthday and since he's never had a party, she decides to throw him a surprise party. Howard fakes a reaction to peanuts to get Leonard out of the apartment while the others set up, but when he can't get Leonard to stay he actually eats some peanuts and needs the medical attention. By the time they get back to the apartment, the party is over.

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    Based on 159 ratings
  • The Tangerine Factor

    Episode 18 Originally aired:  May 19, 2008

    When Leonard finally asks Penny out on a date and she says yes, they each seek the "wisdom" of reluctant advisor, Sheldon. Despite reluctance on both sides, they end up going out on their date after a preemptive kiss.

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    Based on 166 ratings

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