Watch The Big Bang Theory (2007) Online!
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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Episode 1 - Pilot
Release Date: 2007-09-24Brilliant 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.
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Episode 2 - The Big Bran Hypothesis
Release Date: 2007-10-01Leonard 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.
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Episode 3 - The Fuzzy Boots Corollary
Release Date: 2007-10-08Leonard asks a woman out after he finds out that Penny is seeing someone.
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Episode 4 - The Luminous Fish Effect
Release Date: 2007-10-15Sheldon'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.
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Episode 5 - The Hamburger Postulate
Release Date: 2007-10-22Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
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Episode 6 - The Middle-Earth Paradigm
Release Date: 2007-10-29Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
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Episode 7 - The Dumpling Paradox
Release Date: 2007-11-05With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team
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Episode 8 - The Grasshopper Experiment
Release Date: 2007-11-12Raj's parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.
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Episode 9 - The Cooper-Hofstadter Polarization
Release Date: 2008-03-17When 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.
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Episode 10 - The Loobenfeld Decay
Release Date: 2008-03-24Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.
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Episode 11 - The Pancake Batter Anomaly
Release Date: 2008-03-31With 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.
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Episode 12 - The Jerusalem Duality
Release Date: 2008-04-14With 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.
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Episode 13 - The Bat Jar Conjecture
Release Date: 2008-04-21Sheldon 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.
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Episode 14 - The Nerdvana Annihilation
Release Date: 2008-04-28When 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.
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Episode 15 - The Pork Chop Indeterminacy
Release Date: 2008-05-05The 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.
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Episode 16 - The Peanut Reaction
Release Date: 2008-05-12Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
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Episode 17 - The Tangerine Factor
Release Date: 2008-05-19Penny's break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.