The Maternal Combustion (8x23) Pictures

“The Maternal Combustion” – Personalities collide when Sheldon and Leonard’s mothers finally meet. Meanwhile, Howard finally decides to “man up” and do his fair share of the housework – but not without a little help from his friends, on THE BIG BANG THEORY, Thursday, April 30 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Commitment Determination (8x24) Pictures

"The Commitment Determination" -- Sheldon pushes Leonard and Penny to choose a date for their wedding and deals with dramatic changes in his own relationship with Amy, on THE BIG BANG THEORY, Thursday, May 7 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Graduation Transmission (8x22) Pictures

“The Graduation Transmission” – Wolowitz questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially, on THE BIG BANG THEORY, Thursday, April 23 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Communication Deterioration (8x21) Pictures

“The Communication Deterioration” – When Raj is asked to create a message in case a NASA mission discovers alien life, the guys fight over what he should do. Also, Penny is torn between auditioning for a movie or keeping her successful pharmaceutical sales job, on THE BIG BANG THEORY, Thursday, April 16 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Fortification Implementation (8x20) Pictures

“The Fortification Implementation” – 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, and when Penny is invited to appear on Wil Wheaton’s podcast, she and Leonard have a huge, on-air argument, on THE BIG BANG THEORY, Thursday, April 9 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Skywalker Incursion (8x19) Pictures

“The Skywalker Incursion” – When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Dr. Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong, on THE BIG BANG THEORY, Thursday, April 2 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Leftover Thermalization (8x18) Pictures

“The Leftover Thermalization” – Friction ensues when a magazine fails to mention Leonard in an article about the paper he co-wrote with Sheldon. Also, a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor, on THE BIG BANG THEORY, Thursday, March 12 (8:00-8:30 PM, ET/PT), on the CBS Television Network.

The Colonization Application (8x17) Pictures

“The Colonization Application” – Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars. Also, a trip to the pet store ends in a fight for Sheldon and Amy, Leonard surprises Penny with a very “adult” purchase, and, Raj is caught snooping in Emily’s apartment, on THE BIG BANG THEORY, Thursday, March. 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Intimacy Acceleration (8x16) Pictures

“The Intimacy Acceleration” – As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a “zombie.” And, after returning from Mrs. Wolowitz’ funeral, Bernadette and Howard run into trouble at the airport, on THE BIG BANG THEORY, Thursday, Feb. 26 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

The Comic Book Store Regeneration (8x15) Pictures

“The Comic Book Store Regeneration” – Wolowitz receives some shocking news as everyone prepares for the reopening of Stuart’s comic book store. Penny teaches Sheldon how to “let it go,” but can’t follow her own advice after she learns something infuriating about Amy. Also, Leonard and Raj think they spot Nathan Fillion at a restaurant, on THE BIG BANG THEORY, Thursday, Feb. 19 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Nathan Fillion guest stars.

The Troll Manifestation (8x14) Pictures

“The Troll Manifestation” – After Leonard and Sheldon co-publish a physics paper, they must defend themselves against criticism from an online bully. Also, girls’ night finds Penny, Amy and Bernadette confronting embarrassing moments from their past, on THE BIG BANG THEORY, Thursday, Feb. 5 (8:00-8:31, ET/PT), on the CBS Television Network.

The Anxiety Optimization (8x13) Pictures

“The Anxiety Optimization” – In the hopes of achieving a scientific breakthrough, Sheldon invites his friends to challenge him. Meanwhile, Wolowitz invents an embarrassing game about Raj, on THE BIG BANG THEORY, Thursday, Jan. 29 (8:00-8:31, ET/PT), on the CBS Television Network