The Big Bang Theory

E01

Episode 1

★ 7.9

The Bad Fish Paradigm

2008-09-22 · 22m

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

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E02

Episode 2

★ 7.7

The Codpiece Topology

2008-09-29 · 21m

A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

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E03

Episode 3

★ 8.0

The Barbarian Sublimation

2008-10-06 · 21m

Sheldon creates a monster when he introduces Penny to online gaming.

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E04

Episode 4

★ 7.6

The Griffin Equivalency

2008-10-13 · 21m

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

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E05

Episode 5

★ 7.6

The Euclid Alternative

2008-10-20 · 20m

Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

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E06

Episode 6

★ 7.9

The Cooper-Nowitzki Theorem

2008-11-03 · 21m

Sheldon and the gang are confused when a young grad student is attracted to him.

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E07

Episode 7

★ 8.0

The Panty Piñata Polarization

2008-11-10 · 21m

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.

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E08

Episode 8

★ 7.5

The Lizard-Spock Expansion

2008-11-17 · 20m

Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

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E09

Episode 9

★ 7.5

The White Asparagus Triangulation

2008-11-24 · 21m

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

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E10

Episode 10

★ 7.0

The Vartabedian Conundrum

2008-12-08 · 21m

Leonard asks Penny for advice when his new relationship starts moving too fast.

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E11

Episode 11

★ 8.3

The Bath Item Gift Hypothesis

2008-12-15 · 21m

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

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E12

Episode 12

★ 7.5

The Killer Robot Instability

2009-01-12 · 21m

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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E13

Episode 13

★ 7.5

The Friendship Algorithm

2009-01-19 · 21m

Sheldon creates a scientific procedure for making friends.

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E14

Episode 14

★ 7.4

The Financial Permeability

2009-02-02 · 21m

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

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E15

Episode 15

★ 8.1

The Maternal Capacitance

2009-02-09 · 21m

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

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E16

Episode 16

★ 7.5

The Cushion Saturation

2009-03-02 · 21m

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

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E17

Episode 17

★ 7.5

The Terminator Decoupling

2009-03-09 · 21m

Leonard, 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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E18

Episode 18

★ 7.6

The Work Song Nanocluster

2009-03-16 · 20m

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

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E19

Episode 19

★ 7.6

The Dead Hooker Juxtaposition

2009-03-30 · 20m

Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

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E20

Episode 20

★ 7.6

The Hofstadter Isotope

2009-04-13 · 20m

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

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E21

Episode 21

★ 7.5

The Vegas Renormalization

2009-04-27 · 22m

Leonard 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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E22

Episode 22

★ 7.5

The Classified Materials Turbulence

2009-05-04 · 19m

Penny'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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E23

Episode 23

★ 7.5

The Monopolar Expedition

2009-05-11 · 21m

The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.

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