Episode Guide

The Isolation Permutation

The Isolation Permutation

Season 5, Ep. 8

Amy is crushed when Bernadette and Penny go shopping for wedding dresses without her.

Original Air Date: November 3, 2011

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Good Guy Fluctuation

Good Guy Fluctuation

Season 5, Ep. 7

An attractive comic book artist tests Leonard and Priya's relationship; Sheldon tries to scare his friends.

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The Rhinitis Revelation

The Rhinitis Revelation

Season 5, Ep. 6

Sheldon finds himself competing with the gang for his mother's attention when she visits.

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The Wiggly Finger Catalyst

The Wiggly Finger Catalyst

Season 5, Ep. 4

Raj meets a woman with whom he's able to talk.

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The Pulled Groin Extrapolation

The Pulled Groin Extrapolation

Season 5, Ep. 3

Amy and Leonard try to become better acquainted; Bernadette, Howard and Mrs. Wolowitz spend the weekend together.

The Skank Reflex Analysis *Premiere*

The Skank Reflex Analysis *Premiere*

Season 5, Ep. 1

Penny hits a low point when she realizes what she's done by sleeping with Raj; Sheldon becomes the leader of the paintball team.

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The Roommate Transmogrification

The Roommate Transmogrification

Season 4, Ep. 24

Hearing Star Trek sex games between Leonard and Priya sends Raj to live with Sheldon. Bernadette's earning her Ph.D makes the guys mock Wolowitz for not having one even more.

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The Engagement Reaction

The Engagement Reaction

Season 4, Ep. 23

Mrs. Wolowitz ends up in the hospital after Howard tells her he's marrying Bernadette. While there, Leonard stresses over Penny and Priya warming up to one another.

The Wildebeest Implementation

The Wildebeest Implementation

Season 4, Ep. 22

Amy recognizes a dinner invitation to be a chance for Bernadette to spy on Leonard and Priya for Penny. Meanwhile, a lonely Raj considers taking experimental medication to cure himself of his inability to talk to women while sober, and Sheldon devises three-person chess.

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The Agreement Dissection

The Agreement Dissection

Season 4, Ep. 21

Miffed over Priya breaking down the Roommate Agreement using legal theory, Sheldon joins Penny, Bernadette, and Amy on their girls' night.

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The Herb Garden Germination

The Herb Garden Germination

Season 4, Ep. 20

Sheldon and Amy decide to start rumors about themselves as a social test. Meanwhile, Howard takes his relationship with Bernadette to an even higher level.

The Zarnecki Incursion

The Zarnecki Incursion

Season 4, Ep. 19

When Sheldon has his World of Warcraft account hacked and his character stolen from, the guys team up to discover out who did it. Meanwhile, Bernadette and Amy try to help Penny deal with Leonard's continuing relationship with Priya.

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The Prestidigitation Approximation

The Prestidigitation Approximation

Season 4, Ep. 18

Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Priya disapproves of Leonard continuing to be friends with Penny.

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The Toast Derivation

The Toast Derivation

Season 4, Ep. 17

Told Leonard is the center of the gang and miffed that they've started hanging out at Raj's, Sheldon seeks to form a new group of friends of which he can be the center.

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The Cohabitation Formulation

The Cohabitation Formulation

Season 4, Ep. 16

Bernadette tells Howard that it's time to choose between moving in with her or staying with his mother. Leonard discovers Raj's sister Priya is back in town and reconnects with her, and Amy tries to comfort Penny when she finds out.

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The Benefactor Factor

The Benefactor Factor

Season 3, Ep. 15

After meeting at a fundraising gala, an aged, but wealthy, Caltech donor makes Leonard ponder if he's willing to have sex with her to secure another donation.

The Thespian Catalyst

The Thespian Catalyst

Season 4, Ep. 14

Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about Bernadette.

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The Love Car Displacement

The Love Car Displacement

Season 4, Ep. 13

A science convention at a hotel leads to Bernadette running into an ex-boyfriend and Wolowitz worrying he can't quite compare.

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The Bus Pants Utilization

The Bus Pants Utilization

Season 4, Ep. 12

Their friendship becomes strained when Sheldon tries to take over Leonard's creation of a smartphone application that solves differential equations.

The Justice League Recombination

The Justice League Recombination

Season 4, Ep. 11

The guys get Zack and Penny to join their Justice League costume for a New Year's Eve bash at the comic book store.

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The Alien Parasite Hypothesis

The Alien Parasite Hypothesis

Season 4, Ep. 10

Amy crushes on one of Penny's dim ex-boyfriends, Zack. Raj and Wolowitz argue over who'd be the better superhero.

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The Boyfriend Complexity

The Boyfriend Complexity

Season 4, Ep. 9

When Penny's father visits, she gets Leonard to pretend to still be her boyfriend. Meanwhile, Howard, Raj, and Bernadette spend the night on an astronomy project.

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The 21-Second Excitation

The 21-Second Excitation

Season 4, Ep. 8

The guys camp out in line to see a print of Raiders of the Lost Ark with 21 extra seconds and are outraged to see Wil Wheaton and his friends being allowed to skip the line. Penny and Bernadette invite Amy to their girls night.

The Apology Insufficiency

The Apology Insufficiency

Season 4, Ep. 7

The rest of the gang is interviewed by the FBI for Wolowitz's security clearance, with Sheldon accidentally letting slip some damaging information.

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The Irish Pub Formulation

The Irish Pub Formulation

Season 4, Ep. 6

When Raj's sister has a one-day layover he forbids the others from hooking up with her, unaware she and Leonard already did long ago.

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