Episode Guide

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.

The Desperation Emanation

The Desperation Emanation

Season 4, Ep. 5

Leonard is depressed to realize all the other guys have girlfriends, while he doesn't. Amy wants to introduce Sheldon to her mother.

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The Hot Troll Deviation

The Hot Troll Deviation

Season 4, Ep. 4

Wolowitz tries to get back together with Bernadette. Sheldon and Raj go to war at the university.

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The Zazzy Substitution

The Zazzy Substitution

Season 4, Ep. 3

When Sheldon "breaks up" with Amy, the guys worry when he starts replacing her with cats.

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The Cruciferous Vegetable Amplification

The Cruciferous Vegetable Amplification

Season 4, Ep. 2

Sheldon calculates that he'll be dead before technology exists to download his consciousness into a robot, so he goes on a binge of healthy living and ultra-safety.

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The Robotic Manipulation

The Robotic Manipulation

Season 4, Ep. 1

Howard uses a robotic arm for his own pleasure. Penny assists Sheldon with his first date.

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The Lunar Excitation

The Lunar Excitation

Season 3, Ep. 23

Howard and Raj try to find the perfect match for Sheldon by setting him up on an Internet dating site. Seeing her moronic new boyfriend interact with the gang makes it abundantly clear to Penny that she can't go back to dating stereotypical dumb jocks after dating Leonard.

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The Staircase Implementation

The Staircase Implementation

Season 3, Ep. 22

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting for her the story of how he met and moved in with Sheldon.

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The Plimpton Stimulation

The Plimpton Stimulation

Season 3, Ep. 21

Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido.

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The Spaghetti Catalyst

The Spaghetti Catalyst

Season 3, Ep. 20

Subsequent to Leonard and Penny's break-up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

The Wheaton Recurrence

The Wheaton Recurrence

Season 3, Ep. 19

Sheldon gets to square off on the bowling alley against nemesis Wil Wheaton. Meanwhile, Leonard's miffed when Penny doesn't respond the way he hoped after saying, "I love you."

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The Pants Alternative

The Pants Alternative

Season 3, Ep. 18

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him get ready for the big night.

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The Precious Fragmentation

The Precious Fragmentation

Season 3, Ep. 17

The discovery of a prop ring from The Lord of the Rings movies puts a strain on the guys' friendship.

The Excelsior Acquisition

The Excelsior Acquisition

Season 3, Ep. 16

An appearance in traffic court comes at the worst possible time for Sheldon—the same day Stan Lee is appearing at the comic book store.

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The Large Hadron Collision

The Large Hadron Collision

Season 3, Ep. 15

Leonard faces a dilemma in choosing between Sheldon or Penny to accompany him to Switzerland to see CERN's Large Hadron Collider on Valentine's Day.

The Einstein Approximation

The Einstein Approximation

Season 3, Ep. 14

Stuck on the solution to a physics problem, Sheldon seeks a number of alternative approaches to change his thinking and free the mental block—including working with Penny at The Cheesecake Factory.

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The Bozeman Reaction

The Bozeman Reaction

Season 3, Ep. 13

Leonard and Sheldon turn to their friends to create a state-of-the-art security system.

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Next Episode

Thursday at 8pm ET on CTV

 

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