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Season 3, Episode 5 - A Pineapple and the Bosom of Male Friendship Airs October 24, 2019 at 8:00/7:00c on CBS After being released from the mental hospital, Dr. Sturgis unexpectedly breaks up with Meemaw. Wallace Shawn and Richard Kind guest star.

Season 3, Episode 3 - An Entrepreneurialist and a Swat on the Bottom Airs October 10, 2019 at 8:00/7:00c on CBS Sheldon takes matters into his own hands when Meemaw refuses to drive him to a lecture with Dr. Linkletter (Ed Begley, Jr.). Also, Georgie tries to impress Veronica with his new business venture.

The Maternal Conclusion Airs Thursday, May 9 at 8/7c on CBS Leonard is pleasantly surprised when Beverly (Christine Baranski) comes to visit and she's genuinely kind to him, until he finds out the real reason she's there. Also, Denise and Stuart overstay their welcome at the Wolowitz house. Christine Baranski returns as Dr. Beverly Hofstadter.

The Plagiarism Schism 4 episodes left Airs Thursday, May 2 at 8/7c on CBS Kripke (John Ross Bowie) has proof that Dr. Pemberton (Sean Astin) plagiarized his thesis in college, and Sheldon and Amy aren’t sure if they should turn him in or not. Also, Wolowitz is happily surprised to learn that Bernadette wasn’t the only waitress at the Cheesecake Factory who had a crush on him back in the day. John Ross Bowie, Joshua Malina, Sean Astin and Kal Penn guest star.

The Inspiration Deprivation Airs Thursday, April 18 at 8/7c on CBS The concept of what it would mean for women everywhere if Amy were to win a Nobel Prize causes Amy to have a meltdown. Also, Koothrappali and Wolowitz try to relive the good old days after Wolowitz buys a scooter that looks like the one he had years ago. Oscar-winning actress Regina King returns as Janine in the episode.

The Laureate Accumulation Airs Thursday, April 4 at 8/7c on CBS When competitors Pemberton (Sean Astin) and Campbell (Kal Penn) charm America on a publicity tour, Sheldon and Amy try to bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side. Also, Halley's fear of the dark leads to opportunity and conflict for Howard, Bernadette and Stuart.

The D & D Vortex Airs Thursday, February 21 at 8/7c on CBS When the gang finds out Wil Wheaton hosts a celebrity Dungeons and Dragons game involving William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith, deception and betrayal are the path to make it to the one open seat.

The Donation Oscillation Airs Thursday, February 7 at 8/7c on CBS Penny tries to seduce an abstaining Leonard to ruin his “donation” for her ex-boyfriend, Zack (Brian Thomas Smith), and his wife, Marissa (Lindsey Kraft). Also, Wolowitz, Bernadette, Anu (Rati Gupta) and Koothrappali turn Koothrappali’s canceled bachelor party into a couple’s trip aboard the “vomit comet”. Keith Carradine returns as Penny's father, Wyatt.

The Meteorite Manifestation Airs Thursday, January 31 at 8/7c on CBS Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law. Also, Leonard is disappointed when his friends exclude him from a scientific project. Andy Daly guest stars as Nathan. Brian Posehn and Lauren Lapkus return as Bert and Denise, respectively.

Season 2, Episode 13 - A Nuclear Reactor and a Boy Called Lovey Airs January 17, 2019 at 8:30/7:30c on CBS Sheldon attempts to build a nuclear reactor. Also, a university cocktail party gets heated when Dr. Sturgis’ colleague, Dr. Linkletter, flirts with Meemaw, and Georgie is heartbroken when he learns Veronica has a boyfriend. Ed Begley, Jr. guest stars.

The Confirmation Polarization Airs Thursday, January 17 at 8/7c on CBS When Sheldon and Amy’s super asymmetry theory is proven by two physicists, Dr. Pemberton (Sean Astin) and Dr. Campbell (Kal Penn) from Chicago, they’re thrilled, until they try to kick Amy off the Nobel nomination. Also, Bernadette has a big success at work and Penny’s going to be a part of it – whether she wants to or not. Sean Astin and Kal Penn guest star.

The Propagation Proposition Airs Thursday, January 10 at 8/7c on CBS Penny's ex-boyfriend, Zack (Brian Thomas Smith), and his wife want a baby, but when Zack is infertile, they ask Leonard for help. Also, Koothrappali attempts to mend things with his ex-fiancée, Anu.

The Paintball Scattering Airs Thursday, January 3 at 8/7c on CBS Penny and Leonard organize a paintball game that results in mayhem when Sheldon is jealous of Amy. Also, Koothrappali catches Anu with her ex-boyfriend, and Stuart doesn’t want to move in with Denise.

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 VCR Illumination Airs Thursday, December 6 at 8/7c on CBS Sheldon and Amy are still down about their theory being disproven, but a VHS tape from Sheldon's past inspires him not to give up. Also, Bernadette turns into a pageant mom when she tries to help Wolowitz ace his Magic Castle audition. Young Sheldon stars Iain Armitage, Lance Barber and Montana Jordan guest star. Christine Baranski returns as Beverly Hofstadter.

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.

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.

'The Consummation Deviation' - Season 12, Episode 8 Airs Thursday, November 8 at 8/7c on CBS. Sheldon tries to bond with Amy’s father, but when Wolowitz lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Also, Koothrappali and Anu try to get physical for the first time.

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 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 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.

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 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.

'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.

'The Procreation Calculation' - Season 12, Episode 3 Airs Thursday, October 4 at 8/7c on CBS. The Wolowitzes' life gets complicated when Stuart starts bringing his new girlfriend home. Also, Penny and Leonard talk about starting a family while Koothrappali explores an arranged marriage. Keith Carradine returns as Penny's father, Wyatt.