Episode Guide :: Season 1

# Episode Title Original Air Date User Rating
101 Pilot September 24, 2007  4.5 
Leonard and Sheldon meet their new neighbor Penny. Leonard is instantly smitten with her, but Sheldon feels he's chasing an impossible dream.
102 The Big Bran Hypothesis October 1, 2007  4.5 
Leonard hopes to make a good impression with Penny by volunteering to sign for a package of hers. When Leonard and Sheldon move the package to her apartment, Sheldon is disturbed by her apparent lack of tidiness.
103 The Fuzzy Boots Corollary October 8, 2007  4.3 
Leonard's hopes of a relationship with Penny are dashed when he sees her kiss another guy, so he decides to ask his colleague Leslie Winkle out.
104 The Luminous Fish Effect October 15, 2007  4.5 
When Sheldon is fired, his life descends into a series of bizarre obsessions, including "fixing" eggs and weaving ponchos. A concerned Leonard decides there's only one person who can bring Sheldon back from the brink: his mother.
105 The Hamburger Postulate October 22, 2007  3.9 
Leonard is seduced by Leslie Winkle but she only wants a one night stand. Leonard is concerned his dalliance with Leslie will affect his chances with Penny.
106 The Middle-Earth Paradigm October 29, 2007  4.4 
The whole gang attends Penny's Halloween party, where Leonard's feelings for Penny come to the fore when her ex-boyfriend Kurt shows up. Leonard's attempts to impress Penny by standing up to Kurt lead to humiliation for Leonard.
107 The Dumpling Paradox November 5, 2007  4.6 
Penny's promiscuous friend from Nebraska is in town and Wolowitz quickly seduces her, taking over Penny's apartment in the process. Penny takes refuge on Sheldon and Leonard's couch. With Wolowitz otherwise engaged, the guys enlist Penny as the fourth member of their Halo team.
108 The Grasshopper Experiment November 12, 2007  4.2 
When Raj is set up on a blind date by his parents, he worries he won't be able to talk to his date. Meanwhile, Penny practices her bar tending skills, resulting in the discovery that Raj can talk to women with the help of alcohol.
109 The Cooper-Hofstadter Polarization March 17, 2008  4.5 
When Sheldon and Leonard are asked to present their work at a physics conference, Sheldon unilaterally decides not to. Leonard and Sheldon feud when Leonard decides to present their work alone in spite of Sheldon's objections. Penny's attempts at reconciling the pair only make matters worse.
110 The Loobenfeld Decay March 24, 2008  4.2 
When Leonard lies to Penny to avoid having to see her perform in a musical, Sheldon becomes concerned with the flimsiness of Leonard's lie. Sheldon constructs a much more elaborate lie which leads to the appearance of a fictional cousin.
111 The Pancake Batter Anomaly March 31, 2008  4.7 
When Sheldon catches the flu, Leonard flees the apartment to avoid having to care for a needy Sheldon. After Sheldon turns up at the Cheesecake Factory, Penny is left to care of him.
112 The Jerusalem Duality April 14, 2008  4.0 
Sheldon is rattled when a 15-year-old physics prodigy, Dennis Kim, visits the university. Sheldon loses faith in his own work in the presence of the boy genius, so he decides to leave theoretical physics behind and focus on obtaining the Nobel Peace Prize. Concerned by Sheldon's career turn, the guys seek to derail Dennis Kim's progress.
113 The Bat Jar Conjecture April 21, 2008  4.4 
The guys enter the college's Physics Bowl tournament, but Sheldon's inability to be a team player gets him thrown off the team. Sheldon decides to enter his own team, while the guys recruit Sheldon's nemesis, Leslie Winkle.
114 The Nerdvana Annihilation April 28, 2008  4.3 
Leonard accidentally buys a full size time machine prop from the classic 1960s movie "The Time Machine". As the guys are transporting the machine to their apartment, they inconvenience Penny, who criticizes Leonard and his geeky interests.
115 The Pork Chop Indeterminacy May 5, 2008  4.3 
Sheldon's attractive twin sister, Missy, is in town and the guys can't avoid hitting on her. As they all vie for Missy's affections, Leonard devises a plan to eliminate his rivals. Eventually, Sheldon decides he should determine who can date his sister. Meanwhile, Raj takes part in a drug trial to try overcome his selective mutism.
116 The Peanut Reaction May 12, 2008  4.3 
When Penny finds out that Leonard has never celebrated his birthday, she sets out to throw him a surprise party. However, a quick trip to an electronics store with Sheldon for a birthday present takes longer than she expected, forcing Howard to take drastic action to stall Leonard.
117 The Tangerine Factor May 19, 2008  4.6 
When Penny breaks up with her boyfriend after he posts intimate details about their relationship on his blog, Leonard tries to comfort her but inadvertently convinces her to get back with her ex-boyfriend. When it turns out her boyfriend has already moved on, Penny is angry at Leonard for his bad advice. Later, Leonard asks Penny out on a date and she says yes. Leonard and Penny each turn to Sheldon for romantic advice.

Season 1 DVD

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Enjoy the complete first season of The Big Bang Theory all over again on DVD. All seventeen episodes of the show's premiere season and a behind-the-scenes featurette are presented on this three-disc box-set.

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Season Recap

In The Big Bang Theory's first season, Penny, an attractive waitress and aspiring actress, moves into the apartment across the hall from geeky physicists Sheldon and Leonard. Penny soon becomes a part of their social group, which includes the equally geeky engineer Howard Wolowitz and astrophysicist Raj Koothrappali.

Leonard is quickly smitten with Penny and his desire to start a romantic relationship with her would form the overarching plot of the show's first season. Leonard and Penny would go on their first date in the season finale.

The Big Bang Theory's first season aired between September 24, 2007 and May 19, 2008. Only seventeen episodes were produced, due to a strike by the Writers Guild of America. The Big Bang Theory was renewed for a second season in February 2008. The show ranked #68 in the ratings for the 2007/08 season.