Episode Guide

FINALE: The Commitment Determination

FINALE: The Commitment Determination

Season 8, Ep. 24

Leonard and Penny are pressured to set a wedding date by Sheldon, whose relationship with Amy has taken an interesting turn.

First Aired: May 7, 2015 

The Maternal Combustion

The Maternal Combustion

Season 8, Ep. 23

Sheldon's and Leonard's mothers finally come face to face and their personalities collide.

First Aired: April 30, 2015. 

The Graduation Transmission

The Graduation Transmission

Season 8, Ep. 22

Leonard and Penny are headed to New Jersey, where Leonard is scheduled to give a high school commencement speech. Raj's father is tired of his reckless spending habits.

First Aired: April 23, 2015. 

The Communication Deterioration

The Communication Deterioration

Season 8, Ep. 21

The guys clash about a message that could be used for contacting aliens.

First Aired: April 16, 2015. 

The Fortification Implementation

The Fortification Implementation

Season 8, Ep. 20

When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had.

First Aired: April 9, 2015. 

The Skywalker Incursion

The Skywalker Incursion

Season 8, Ep. 19

While on their way to UC Berkeley, Sheldon and Leonard take a detour in hope of meeting an idol.

First Aired: April 2, 2015.

The Leftover Thermalization

The Leftover Thermalization

Season 8, Ep. 18

A magazine article only credits Sheldon in an article about a paper he co-wrote with Leonard.

First Aired: March 12, 2015.

The Colonization Application

The Colonization Application

Season 8, Ep. 17

Amy finds out that Sheldon applied for a one-way mission to colonize Mars.

First Aired: March 05, 2015.

The Intimacy Acceleration

The Intimacy Acceleration

Season 8, Ep. 16

Penny and Sheldon design an experiment -- as a joke -- to make participants fall in love.

First Aired: February 26, 2015.


The Comic Book Store Regeneration

The Comic Book Store Regeneration

Season 8, Ep. 15

Amid the excitement of Stuart reopening his comic-book store, Howard gets some unsettling news; and after teaching Sheldon how to "let it go," Penny doesn't practice what she preaches when she learns something maddening about Amy. 

First Aired: February 19, 2015. 

The Troll Manifestation

The Troll Manifestation

Season 8, Ep. 14

An online troll rips Leonard and Sheldon's published physics paper, so the guys rally to defend the two and expose the bully, while a girls night out leads to Penny, Amy and Bernadette dishing about embarrassing past events.

First Aired: February 5, 2015. 

The Anxiety Optimization

The Anxiety Optimization

Season 8, Ep. 13

Sheldon becomes concerned that his cushy lifestyle is impacting his professional progress and keeping him from achieving scientific renown, so he asks the gang to make life more difficult for him. Meanwhile, Howard invents an unflattering game about Raj.

First Aired: January 29, 2015. 

The Space Probe Disintegration

The Space Probe Disintegration

Season 8, Ep. 12

While Raj eagerly awaits data from a space probe in which he was involved, Howard keeps distracting him. Later, dress shopping with Penny and Amy doesn't exactly prove to be a good fit for Leonard and Sheldon.

First Aired: January 8, 2015. 

The Clean Room Infiltration

The Clean Room Infiltration

Season 8, Ep. 11

On Christmas Eve, Amy plans a traditional Victorian dinner, while Raj, Leonard and Howard scramble to remove a pigeon that flew into the clean room at the university. To prove a point to Amy, a Scrooge-like Sheldon buys her the worst possible gift.

First Aired: December 11, 2014. 

The Champagne Reflection

The Champagne Reflection

Season 8, Ep. 10

It's a banner day for Sheldon as he bids a sad farewell to his "Fun With Flags" podcast. Meanwhile, Leonard, Howard and Raj probe a late professor's research in search of some hidden significance; and Bernadette is surprised when Penny reveals how her co-workers really feel about her.

First Aired: November 20, 2014

The Septum Deviation

The Septum Deviation

Season 8, Ep. 9

Leonard needs surgery for a deviated septum, and Sheldon gets his nose out of joint because he feels an operation is too dangerous and that his roommate may not make it out alive. Meanwhile, a distraught Raj learns his parents have divorced on the eve of their 40th anniversary.

First Aired: November 13, 2014 

The Prom Equivalency

The Prom Equivalency

Season 8, Ep. 8

Amy and Bernadette organize a prom to be held atop the guys' apartment complex, but Sheldon is leery of all the prom pomp, circumstance and romancing that goes with it.

First Aired: Novemeber 6, 2014

The Misinterpretation Agitation

The Misinterpretation Agitation

Season 8, Ep. 7

Penny's flirtatious sales pitch leaves a doctor-client smitten and the guys must pitch in to help her deal with him, while, Bernadette and Amy debate whether female scientists ought to play the sexuality card.

First Aired: October 30, 2014

The Expedition Approximation

The Expedition Approximation

Season 8, Ep. 6

Sheldon and Raj undertake an underground research expedition that turns into a test of how long before they get under each other's skin. Meanwhile, Leonard and Penny argue about money, and go to Wolowitz and Bernadette for advice.

First Aired: October 20, 2014. 

The Focus Attenuation

The Focus Attenuation

Season 8, Ep. 5

With the girls away in Vegas for the weekend, the guys try to invent “the next big thing,” but only come up with new ways to procrastinate.

First Aired: October 13, 2014. 

The Hook-Up Reverberation

The Hook-Up Reverberation

Season 8, Ep. 4

Raj's girlfriend, Emily, gives Penny the cold shoulder after he reveals some info about their past history; and the guys contemplate buying into Stuart's comic-book emporium.

First Aired: October 6, 2014. 

The First Pitch Insufficiency

The First Pitch Insufficiency

Season 8, Ep. 3

A nervous Wolowitz is thrown for a loop when NASA asks him to toss out the first pitch at a Los Angeles Angels baseball game. Meanwhile, Sheldon brags that he and Amy are a better couple than Leonard and Penny, so they set out to prove he's way off base.

First Aired: September 29, 2014.


READ: 'The Big Bang Theory' couples take on Major League Baseball and one another in an all-new episode

The Junior Professor Solution

The Junior Professor Solution

Season 8, Ep. 2

Sheldon is ordered to teach a class, and the gang is surprised when Howard signs up to take it; and tensions between Penny and Bernadette afford Amy an opportunity to play one against the other.

First Aired: September 22, 2014.

The Locomotion Interruption

The Locomotion Interruption

Season 8, Ep. 1

In the series 8 premiere, Amy and Leonard take a surprise road trip to Arizona to retrieve Sheldon, while Penny goes on a job interview at Bernadette's company, and Howard has problems wrapping his head around Stuart's relationship with Mrs. Wolowitz.

First Aired: September 22, 2014.


The Status Quo Combustion: FINALE

The Status Quo Combustion: FINALE

Season 7, Ep. 24

Faced with an uncertain future, Sheldon considers a major change; Emily and Raj decide to take things to the next level.

First Aired: May 15, 2014

READ: ‘The Big Bang Theory’ finale could mark a big change for Sheldon Cooper

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