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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
The Gorilla Dissolution
Season 7, Ep. 23
A bad day compels Penny to re-evaluate her choices -- including Leonard; Bernadette and Howard must care for Mrs. Wolowitz; Sheldon gives Raj advice on relationships.
First Aired: May 8, 2014
The Proton Transmogrification
Season 7, Ep. 22
Professor Proton (Bob Newhart) helps Sheldon deal with grief; Leonard gets into a competition with Penny; Bernadette and Amy prepare a ``Star Wars Day'' gift for the guys.
First Aired: May 1, 2014
The Anything Can Happen Recurrence
Season 7, Ep. 21
Sheldon gives spontaneity a try, which causes unexpected friction for Penny, Bernadette and Amy; Raj asks Howard for help with preparation for a date with Emily.
First Aired: April 24, 2014
The Relationship Diremption
Season 7, Ep. 20
Sheldon faces a personal crisis after deciding he's wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.
First Aired: April 10, 2014
The Indecision Amalgamation
Season 7, Ep. 19
Raj struggles with guilt when he dates two women at once; Penny has a chance to play a part in a cheesy movie; Sheldon is torn between two gaming systems.
READ: The 'Big Bang Theory' gang is wracked with indecision
First aired: April 3, 2014