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'The Grant Allocation Derivation' - Season 12, Episode 7 Airs Thursday, November 1 at 8/7c on CBS. Leonard is caught between a rock and a hard place when he's responsible for distributing extra grant money. Also, Bernadette turns the backyard playhouse into a hideaway from her husband and kids. Joshua Malina and John Ross Bowie return as President Siebert and Barry Kripke, respectively.

Season 2, Episode 10 - A Stunted Childhood and a Can of Fancy Mixed Nuts Airs December 6, 2018 at 8:30/7:30c on CBS When Sheldon learns that people with stunted childhoods can turn into social outcasts, he tries to act like a kid. Also, Meemaw and Dr. Sturgis' relationship is tested when she teaches him how to drive. Wallace Shawn (The Princess Bride, Toy Story) and Mckenna Grace (Gifted) return as Dr. John Sturgis and Paige, respectively, in this episode.

'The Tesla Recoil' - Season 11, Episode 8 Airs Thursday, November 16 at 8/7c on CBS. Leonard and Wolowitz are furious after they learn Sheldon went to work with the military behind their backs. Also, while Bernadette is on bed rest, she asks Raj to do some digging when she suspects Ruchi is trying to steal her job.

'The Planetarium Collision' - Season 12, Episode 5 Airs Thursday, October 18 at 8/7c on CBS. When Amy doesn’t have time to work on super-asymmetry, Sheldon goes to great lengths to ensure she’s available to work with him even it if means accidentally sabotaging her career in the process. Also, Koothrappali doesn’t want Wolowitz to join him in hosting a show at the planetarium. Bob Newhart and Joshua Malina guest star.

Season 2, Episode 9 - Family Dynamics and a Red Fiero Airs November 15, 2018 at 8:30/7:30c on CBS Sheldon studies his family for a psychology project, and Thanksgiving dinner turns into a family fight when George Sr. is offered a job in Oklahoma. Wallace Shawn returns as Dr. John Sturgis.

'The Tam Turbulence' - Season 12, Episode 4 Airs Thursday, October 11 at 8/7c on CBS. When Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend, Leonard takes matters into his own hands. Also, Bernadette and Penny take out Raj’s fiancée, Anu, for dinner to get the skinny on her. Jerry O'Connell returns as Sheldon's older brother, George.

Season 2, Episode 8 - An 8-Bit Princess and a Flat Tire Genius Airs November 8, 2018 at 8:30/7:30c on CBS A video game takes over Sheldon and Meemaw’s life. Also, George Sr. is jealous when Georgie bonds with Herschel at the auto shop. Billy Gardell (Mike & Molly) guest stars.

Season 2, Episode 7 - Carbon Dating and a Stuffed Raccoon Airs November 1, 2018 at 8:30/7:30c on CBS Sheldon gets into trouble with fellow child genius Paige at the science museum. Also, George Sr. is forced to play therapist to Paige's bickering parents, and Mary, Georgie and Missy help Meemaw with a garage sale. Wallace Shawn (The Princess Bride) and Mckenna Grace (Gifted) return as Dr. John Sturgis and Paige, respectively.

'The Wedding Gift Wormhole' - Season 12, Episode 2 Airs Thursday, September 27 at 8/7c on CBS. Sheldon and Amy drive themselves crazy trying to figure out what "perfect gift" Leonard and Penny gave them for their wedding. Also, Koothrappali decides he wants to settle down and asks his father to arrange a marriage for him. Brian George (Dr. Koothrappali), Brian Posehn (Bert) and Lauren Lapkus (Denise) guest star in the episode.

'The Conjugal Configuration' - Season 12, Episode 1 Airs Monday, September 24 at 8/7c on CBS. Sheldon and Amy's honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy's parents, Mr. and Mrs. Fowler. Also, Koothrappali insults physicist Neil deGrasse Tyson and starts a Twitter war.

Season 2, Episode 5 - A Research Study and Czechoslovakian Wedding Pastries Airs October 18, 2018 at 8:30/7:30c on CBS Dr. Sturgis recommends Sheldon and Missy for a university research study on twins, and Mary is unhappy when the test results go to Sheldon's head. Wallace Shawn (The Princess Bride, Toy Story) returns as Dr. John Sturgis.

'The Sibling Realignment' - Season 11, Episode 23 Airs Thursday, May 3 at 8/7c on CBS. When Sheldon learns that his mother won't attend his wedding unless he invites his brother, Georgie (Jerry O'Connell), he and Leonard travel to Texas to end a family feud. Also, the Wolowitz kids inadvertently infest Amy, Bernadette, Wolowitz and Koothrappali with pinkeye.

Season 2, Episode 6 - Seven Deadly Sins and a Small Carl Sagan Airs October 25, 2018 at 8:30/7:30c on CBS Mary clashes with Sheldon's drama teacher over plans for a Halloween fundraiser for the church. Also, Georgie falls for a rebellious teenage girl that Sheldon is tutoring. Jason Alexander (Seinfeld) returns as Sheldon's drama teacher, Mr. Lundy.

'The Retraction Reaction' - Season 11, Episode 2 Airs Monday, October 2 at 8/7c on CBS. Leonard angers the university - and the entire physics community - after he gives an embarrassing interview. Also, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.

Season 1, Episode 22 - Vanilla Ice Cream, Gentlemen Callers, and a Dinette Set Airs May 10, 2018 at 8:30/7:30c on CBS When Meemaw is pursued by two gentlemen callers, Sheldon interferes, forcing her to set some ground rules. Wallace Shawn (The Princess Bride) and Richard Kind (Spin City) guest star.

Season 1, Episode 11 - Demons, Sunday School, and Prime Numbers Airs January 11, 2018 at 8:30/7:30c on CBS A worried Mary sends Sheldon to Sunday school after she finds him playing Dungeons and Dragons with his friends Tam and Billy. Billy Gardell (Mike & Molly) guest stars.

'The Comet Polarization' - Season 11, Episode 21 Airs Thursday, April 19 at 8/7c on CBS. Sheldon's comic book store experiences changes when writer Neil Gaiman puts Stuart's store on the map. Also, Koothrappali takes credit for Penny's astronomical discovery, and friendships are threatened.

'The Monetary Insufficiency' - Season 11, Episode 22 Airs Thursday, April 26 at 8/7c on CBS. Sheldon goes to Vegas to win money for science. Also, Penny and Bernadette take Amy wedding dress shopping, but her terrible choice entangles them in a web of lies. Joshua Malina returns as President Siebert in this episode.

Season 1, Episode 21 - Summer Sausage, a Pocket Poncho, and Tony Danza Airs May 3, 2018 at 8:30/7:30c on CBS While Sheldon is busy keeping tabs on Meemaw’s budding relationship with Dr. Sturgis, George Sr. and Mary attempt to bond with their other children. Wallace Shawn returns as Dr. John Sturgis.

'The Geology Elevation' - Season 10, Episode 9 Airs Thursday, November 17 at 8/7c on CBS. When Bert, a Caltech geologist, wins the MacArthur Genius fellowship, Sheldon is overcome with jealousy. Also, Wolowitz finds an old remote control Stephen Hawking action figure he invented.

Season 1, Episode 20 - A Dog, a Squirrel, and a Fish Named Fish Airs April 26, 2018 at 8:30/7:30c on CBS A battle erupts between the Coopers and Sparks when the Sparks’ new dog terrorizes Sheldon. Billy Gardell (Herschel Sparks), Melissa Peterman (Brenda Sparks) and Wyatt McClure (Billy Sparks) return in the episode.

'The Gates Excitation' - Season 11, Episode 18 Airs Thursday, March 29 at 8/7c on CBS. Penny gets the opportunity to host Bill Gates at work when his company wants to partner with her pharmaceutical company. Also, Leonard, Koothrappali and Wolowitz do everything in their power to meet him, while Sheldon thinks he is the victim of an April Fools prank. Microsoft co-founder Bill Gates guest stars as himself.

Season 1, Episode 19 - Gluons, Guacamole, and the Color Purple Airs April 19, 2018 at 8:30/7:30c on CBS When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by Dr. John Sturgis. Wallace Shawn (The Princess Bride, Toy Story) guest stars.

'The Athenaeum Allocation' - Season 11, Episode 17 Airs Thursday, March 8 at 8/7c on CBS. Leonard jumps through hoops to help secure the perfect wedding venue for Sheldon and Amy. Also, Bernadette and Wolowitz have a hard time deciding who should stay at home with the kids and who should go back to work.

Season 1, Episode 17 - Jiu-jitsu, Bubble Wrap, and Yoo-hoo Airs April 5, 2018 at 8:30/7:30c on CBS Sheldon is bullied by an unlikely character, and Mary and George disagree on how to handle the situation. Billy Gardell (Mike & Molly) reprises his role as Herschel Sparks.