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While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.

The Big Bang Theory

The Monopolar Expedition

Penny makes a surprising revelation about Leonard while on her date with Stuart; Wolowitz finds a critical design flaw in his NASA project.

The Classified Materials Turbulence

Koothrappali and Leonard take Wolowitz to Las Vegas; Sheldon is forced to bunk with Penny when he gets locked out of his apartment.

The Vegas Renormalization

Wolowitz and Leonard decide to check out a local bar on Ladies' Night.

The Hofstadter Isotope

Penny develops a rivalry with a sexy new female neighbor who threatens her position as queen bee of the building.

The Dead Hooker Juxtaposition

Penny's home business turns into a complete nightmare when Sheldon takes over.

The Work Song Nanocluster

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is aboard the train they are taking to San Francisco.

The Terminator Decoupling

A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

The Cushion Saturation

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother (Christine Baranski).

The Maternal Capacitance

Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

The Financial Permeability

TBS features an outstanding array of family-oriented programming. See exclusive specials, compelling documentaries and movies, plus professional sports.

Sheldon develops a scientific procedure for making friends; Kripke controls a new supercomputer.

The Friendship Algorithm

When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose their most important teammate in an upcoming fighting-robot competition.

The Killer Robot Instability

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Watch Hollywood hits like Civil War and behind-the-scenes exclusives when you add CINEMAX to your current DIRECTV package.

Physicists and best friends Leonard and Sheldon learn about the social aspects of life through their relationships with the free-spirited beauty who moves in next door.

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Features an outstanding array of family-oriented programming. See exclusive specials, compelling documentaries and movies, plus professional sports.

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CBS television services from KEPRDT-TV, 19, Yakima, WA.

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CBS television services from KIMADT-TV, 29, Yakima, WA.

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Nickelodeon is a world leader in children's television with shows like Rugrats. Nick at Nite presents America's best loved, family-friendly classic sitcoms like I Love Lucy.

Nickelodeon East HD

Nickelodeon (East) The first network just for kids. Nickelodeon is a world leader in original programming for children with shows like Rugrats.

Nickelodeon East

Nickelodeon (West) The first network just for kids , Nickelodeon is a world leader in original programming for children with shows like Rugrats.

Nickelodeon West

KTLA CW West

MTV, Music Television was the world's first 24-hour video music network. MTV continues to reflect the spirit of rock and roll with popular shows like MTV Unplugged, The Real World, and exciting MTV Video Music Awards.

MTV HD

Music Television, the largest global television network, is where young adults turn to find out what's happening and what's next in music and popular culture.

MTV West HD

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

S2 E11 | The Bath Item Gift Hypothesis

E23 | The Monopolar Expedition

E22 | The Classified Materials Turbulence

E21 | The Vegas Renormalization

E20 | The Hofstadter Isotope

E19 | The Dead Hooker Juxtaposition

E18 | The Work Song Nanocluster

E17 | The Terminator Decoupling

E16 | The Cushion Saturation

E15 | The Maternal Capacitance

E14 | The Financial Permeability

E13 | The Friendship Algorithm

E12 | The Killer Robot Instability