Episodes 23

1

The Bad Fish Paradigm

7.7
September 22, 200821m

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

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2

The Codpiece Topology

7.4
September 29, 200821m

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

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3

The Barbarian Sublimation

7.5
October 6, 200821m

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

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4

The Griffin Equivalency

7.3
October 13, 200821m

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

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5

The Euclid Alternative

7.3
October 20, 200819m

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

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6

The Cooper-Nowitzki Theorem

7.6
November 3, 200820m

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

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7

The Panty Piñata Polarization

7.7
November 10, 200821m

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

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8

The Lizard-Spock Expansion

7.2
November 17, 200820m

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

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9

The White Asparagus Triangulation

7.2
November 24, 200820m

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

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Crew 6

Directed by: Mark Cendrowski

Written by: No writer has been added.

Guest Stars 1 Full Cast & Crew

  1. Sara Rue

    Stephanie Barnett

Episode Images 2 View All Episode Images

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10

The Vartabedian Conundrum

6.8
December 8, 200821m

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

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11

The Bath Item Gift Hypothesis

8.1
December 15, 200820m

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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12

The Killer Robot Instability

7.3
January 12, 200921m

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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13

The Friendship Algorithm

7.3
January 19, 200921m

Sheldon creates a scientific procedure for making friends.

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14

The Financial Permeability

7.1
February 2, 200921m

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

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15

The Maternal Capacitance

8.0
February 9, 200920m

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

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16

The Cushion Saturation

7.2
March 2, 200921m

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

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17

The Terminator Decoupling

7.3
March 9, 200921m

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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18

The Work Song Nanocluster

7.3
March 16, 200920m

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

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19

The Dead Hooker Juxtaposition

7.3
March 30, 200920m

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

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20

The Hofstadter Isotope

7.5
April 13, 200920m

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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21

The Vegas Renormalization

7.3
April 27, 200921m

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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22

The Classified Materials Turbulence

7.3
May 4, 200918m

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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23

The Monopolar Expedition

7.4
Season Finale
May 11, 200921m

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

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