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Season 2 Episode 1 The Bad Fish Paradigm

Penny opens up to a reluctant Sheldon after a less-than-stellar first date with Leonard, placing him in the uncomfortable position of having to keep a secret. Penny opens up to a reluctant Sheldon after a less-than-stellar first date with Leonard, placing him in the uncomfortable position of having to keep a secret.

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Season 2 Episode 2 The Codpiece Topology

Seeing Penny with another guy sends Leonard back to Leslie Winkle, much to Sheldon's dismay. Seeing Penny with another guy sends Leonard back to Leslie Winkle, much to Sheldon's dismay.

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Season 2 Episode 3 The Barbarian Sublimation

Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistantly pesters Sheldon for advice. Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistantly pesters Sheldon for advice.

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Season 2 Episode 4 The Griffin Equivalency

Full of confidence following being named one of People's "30 to Watch Under 30", Raj hits on Penny and becomes impossibly arrogant. Full of confidence following being named one of People's "30 to Watch Under 30", Raj hits on Penny and becomes impossibly arrogant.

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Season 2 Episode 5 The Euclid Alternative

An intervention is used to try to force Sheldon to overcome his fear of driving. An intervention is used to try to force Sheldon to overcome his fear of driving.

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Season 2 Episode 6 The Cooper-Nowitzki Theorem

Sheldon, and his friends, are mystified when a younger undergraduate student is attracted to him. Sheldon, and his friends, are mystified when a younger undergraduate student is attracted to him.

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Season 2 Episode 7 The Panty Piñata Polarization

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate. Howard and Raj search for the America's Next Top Model house. When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate. Howard and Raj search for the America's Next Top Model house.

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Season 2 Episode 8 The Lizard-Spock Expansion

A girl Wolowitz has a major crush on falls for Leonard. Sheldon tries to improve rock-paper-scissors. A girl Wolowitz has a major crush on falls for Leonard. Sheldon tries to improve rock-paper-scissors.

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Season 2 Episode 9 The White Asparagus Triangulation

Sheldon is overexuberant that Leonard finally has a girlfriend matching his high standards. Sheldon is overexuberant that Leonard finally has a girlfriend matching his high standards.

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Season 2 Episode 10 The Vartabedian Conundrum

Leonard seeks Penny's counsel when his relationship with Stephanie takes off faster than he'd like. Sheldon's hypochondriac tendencies get the better of him. Leonard seeks Penny's counsel when his relationship with Stephanie takes off faster than he'd like. Sheldon's hypochondriac tendencies get the better of him.

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Season 2 Episode 11 The Bath Item Gift Hypothesis

Sheldon irks the gangs with his obession with proper Christmas gift protocol. Lenoard's crushed when Penny dates a colleague of his. Sheldon irks the gangs with his obession with proper Christmas gift protocol. Lenoard's crushed when Penny dates a colleague of his.

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Season 2 Episode 12 The Killer Robot Instability

Penny'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. Penny'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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Season 2 Episode 13 The Friendship Algorithm

Looking to get friendly with Barry Kripke to gain access to a piece of high-tech lab equipment, Sheldon develops a flowchart process to make friends. Looking to get friendly with Barry Kripke to gain access to a piece of high-tech lab equipment, Sheldon develops a flowchart process to make friends.

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Season 2 Episode 14 The Financial Permeability

When Sheldon loans money to Penny so she can pay her rent, it leads to Leonard coming face-to-face with her ex, Kurt. When Sheldon loans money to Penny so she can pay her rent, it leads to Leonard coming face-to-face with her ex, Kurt.

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Season 2 Episode 15 The Maternal Capacitance

A visit from Leonard's mother ends up bringing him and Penny closer. A visit from Leonard's mother ends up bringing him and Penny closer.

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Season 2 Episode 16 The Cushion Saturation

Paintball leads to a squabble between Sheldon and Penny, as well as romance between Howard and Leslie. Paintball leads to a squabble between Sheldon and Penny, as well as romance between Howard and Leslie.

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Season 2 Episode 17 The Terminator Decoupling

The gang is thrilled when they see Terminator: The Sarah Connor Chronicles' Summer Glau is also aboard their train to San Francisco for a scientific symposium. Meanwhile, Sheldon frets over having forgotten a paper he wants to present to George Smoot. The gang is thrilled when they see Terminator: The Sarah Connor Chronicles' Summer Glau is also aboard their train to San Francisco for a scientific symposium. Meanwhile, Sheldon frets over having forgotten a paper he wants to present to George Smoot.

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Season 2 Episode 18 The Work Song Nanocluster

Penny's business selling hair accessories out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge. Penny's business selling hair accessories out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge.

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Season 2 Episode 19 The Dead Hooker Juxtaposition

Penny feels threatened when another sexy woman moves into the apartment building and angered when she senses the guys are being taken advantage of. Penny feels threatened when another sexy woman moves into the apartment building and angered when she senses the guys are being taken advantage of.

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Season 2 Episode 20 The Hofstadter Isotope

A fellow comic book enthusiast's hitting on Penny leads to Leonard, Raj, and Howard going to a bar's Ladies' Night. A fellow comic book enthusiast's hitting on Penny leads to Leonard, Raj, and Howard going to a bar's Ladies' Night.

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Season 2 Episode 21 The Vegas Renormalization

Leonard and Raj take Wolowitz to Las Vegas to help him get over his break-up with Leslie. Sheldon, home alone and looking forward to it, locks himself out and has only one other place to stay—Penny's. Leonard and Raj take Wolowitz to Las Vegas to help him get over his break-up with Leslie. Sheldon, home alone and looking forward to it, locks himself out and has only one other place to stay—Penny's.

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Season 2 Episode 22 The Classified Materials Turbulence

Leonard is torn between being honest or self-serving when Stuart asks his advice for an upcoming second date with Penny. Wolowitz realizes there's a crucial error in a toilet he designed for the International Space Station. Leonard is torn between being honest or self-serving when Stuart asks his advice for an upcoming second date with Penny. Wolowitz realizes there's a crucial error in a toilet he designed for the International Space Station.

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Season 2 Episode 23 The Monopolar Expedition

The guys' prestigious offer to work over the summer at the North Pole—and Penny's resultant behavior—leaves Leonard unsure if he should go. The guys' prestigious offer to work over the summer at the North Pole—and Penny's resultant behavior—leaves Leonard unsure if he should go.

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