The Big Bang Theory (2007)
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 - The Bad Fish Paradigm
Release Date: 2008-09-22Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
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Episode 2 - The Codpiece Topology
Release Date: 2008-09-29A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
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Episode 3 - The Barbarian Sublimation
Release Date: 2008-10-06Sheldon creates a monster when he introduces Penny to online gaming.
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Episode 4 - The Griffin Equivalency
Release Date: 2008-10-13Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
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Episode 5 - The Euclid Alternative
Release Date: 2008-10-20Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
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Episode 6 - The Cooper-Nowitzki Theorem
Release Date: 2008-11-03Sheldon and the gang are confused when a young grad student is attracted to him.
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Episode 7 - The Panty Piñata Polarization
Release Date: 2008-11-10When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
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Episode 8 - The Lizard-Spock Expansion
Release Date: 2008-11-17Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
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Episode 9 - The White Asparagus Triangulation
Release Date: 2008-11-24Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
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Episode 10 - The Vartabedian Conundrum
Release Date: 2008-12-08Leonard asks Penny for advice when his new relationship starts moving too fast.
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Episode 11 - The Bath Item Gift Hypothesis
Release Date: 2008-12-15Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
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Episode 12 - The Killer Robot Instability
Release Date: 2009-01-12Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.
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Episode 13 - The Friendship Algorithm
Release Date: 2009-01-19Sheldon creates a scientific procedure for making friends.
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Episode 14 - The Financial Permeability
Release Date: 2009-02-02Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
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Episode 15 - The Maternal Capacitance
Release Date: 2009-02-09Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
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Episode 16 - The Cushion Saturation
Release Date: 2009-03-02A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
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Episode 17 - The Terminator Decoupling
Release Date: 2009-03-09Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.
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Episode 18 - The Work Song Nanocluster
Release Date: 2009-03-16Penny's home business turns into a complete nightmare when Sheldon takes over.
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Episode 19 - The Dead Hooker Juxtaposition
Release Date: 2009-03-30Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
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Episode 20 - The Hofstadter Isotope
Release Date: 2009-04-13A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
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Episode 21 - The Vegas Renormalization
Release Date: 2009-04-27Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
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Episode 22 - The Classified Materials Turbulence
Release Date: 2009-05-04Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.
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Episode 23 - The Monopolar Expedition
Release Date: 2009-05-11The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.