- 0 Pilot (Preair)
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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.
- 1 Pilot
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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.
Average Episode Rating: 4.4 | Air Date: 2007-09-24
- 2 The Big Bran Hypothesis
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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.
Average Episode Rating: 4.2 | Air Date: 2007-10-01
- 3 The Fuzzy Boots Corollary
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Leonard asks a woman out after he finds out that Penny is seeing someone.
Average Episode Rating: 4.1 | Air Date: 2007-10-08
- 4 The Luminous Fish Effect
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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.
Average Episode Rating: 4.7 | Air Date: 2007-10-15
- 5 The Hamburger Postulate
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Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
Average Episode Rating: 4.7 | Air Date: 2007-10-22
- 6 The Middle Earth Paradigm
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Penny hosts a Hallowe'en party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
Average Episode Rating: 4.8 | Air Date: 2007-10-29
- 7 The Dumpling Paradox
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With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team
Average Episode Rating: 4.7 | Air Date: 2007-11-05
- 8 The Grasshopper Experiment
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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.
Average Episode Rating: 4.5 | Air Date: 2007-11-12
- 9 The Cooper-Hofstadter Polarization
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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.
Average Episode Rating: 4.6 | Air Date: 2008-03-17
- 10 The Loobenfeld Decay
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Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.
Average Episode Rating: 4.3 | Air Date: 2008-03-24
- 11 The Pancake Batter Anomaly
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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.
Average Episode Rating: 4.6 | Air Date: 2008-03-31
- 12 The Jerusalem Duality
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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.
Average Episode Rating: 4.3 | Air Date: 2008-04-14
- 13 The Bat Jar Conjecture
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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.
Average Episode Rating: 4.0 | Air Date: 2008-04-21
- 14 The Nerdvana Annihilation
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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.
Average Episode Rating: 4.5 | Air Date: 2008-04-28
- 15 The Pork Chop Indeterminacy
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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.
Average Episode Rating: 5.0 | Air Date: 2008-05-05
- 16 The Peanut Reaction
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Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
Average Episode Rating: 4.7 | Air Date: 2008-05-12
- 17 The Tangerine Factor
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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.
Average Episode Rating: 4.5 | Air Date: 2008-05-19
- 18 DVD Extra - Quantum Mechanics Of The Big Bang Theory