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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 Stockholm Syndrome Final Episode Airs Thursday, May 16 at 8/7c on CBS Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; and Koothrappali makes a new friend, as the gang travels together into an uncharted future, on the series finale of The Big Bang Theory.

'The Space Probe Disintegration' - Season 8, Episode 12 Airs Thursday, January 8 at 8/7c on CBS. Wolowitz tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.

'The Imitation Perturbation' - Season 12, Episode 6 Airs Thursday, October 25 at 8/7c on CBS. When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party. Also, Leonard is shocked that Penny doesn't remember their first kiss.

"The Contractual Obligation Implementation" - Leonard, Sheldon and Wolowitz speak to junior high girls about careers in science. Meanwhile, Koothrappali plans a date with Lucy, on THE BIG BANG THEORY, Thursday, March 7 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Episode Guide | Wiki

Season 3, Episode 21 - A Secret Letter and a Lowly Disc of Processed Meat Airs April 30, 2020 at 8:00/7:00c on CBS Sheldon discovers that Mary's been keeping a secret about his future. Also, Meemaw is furious when she learns Dale fired Georgie. Wallace Shawn and Craig T. Nelson guest star.

Season 3, Episode 17 - An Academic Crime and a More Romantic Taco Bell Airs March 5, 2020 at 8:00/7:00c on CBS Dr. Sturgis is furious when Sheldon accuses him of plagiarism. Also, Mary sets out to find a “girl trophy” for Missy’s end-of-season baseball ceremony, and Georgie has an awkward run-in with Veronica (Isabel May) while on a date with his new girlfriend, Jana (Ava Allan). Stand-up comedian Louie Anderson guest stars as Ralph, a Trophy Store employee.

Season 3, Episode 20 - A Baby Tooth and the Egyptian God of Knowledge Airs April 16, 2020 at 8:00/7:00c on CBS Sheldon has a scientific breakthrough at the dentist's office. Also, Dale (Craig T. Nelson) and Meemaw go to the casino, and Georgie makes a big mistake when Dale leaves him in charge of the store. Wallace Shawn and Craig T. Nelson guest star.

The Mystery Date Observation - Season 9, Episode 8 Airs Thursday, November 12 at 8/7c on CBS Sheldon, Wolowitz and Koothrappali post an online advertisement to find Sheldon a new girlfriend Also, when Amy is coy with the details of a guy she is dating, Penny and Bernadette decide to spy. Stephen Merchant and Analeigh Tipton guest star. Rate the Episode

Season 3, Episode 19 - A House for Sale and Serious Woman Stuff Airs April 2, 2020 at 8:00/7:00c on CBS When Sheldon learns the house next door is for sale, he takes it upon himself to find the perfect neighbors. Also, Missy is torn when she's forced to pitch against her boyfriend at the baseball game.

Season 3, Episode 18 - A Couple Bruised Ribs and a Cereal Box Ghost Detector Airs March 12, 2020 at 8:00/7:00c on CBS When George Sr. accidentally lands the school librarian, Ms. Hutchins (Sarah Baker), in the hospital, the Cooper family must nurse her back to health. Also, Meemaw gives Georgie relationship advice.

Season 3, Episode 16 - Pasadena Airs February 20, 2020 at 8:00/7:00c on CBS Sheldon visits CalTech for the very first time. Also, Georgie is furious when Mary listens in on a phone call with his girlfriend, and Meemaw tries to cheer up a jealous Missy. Wallace Shawn guest stars as Dr. John Sturgis.

Season 3, Episode 10 - Teenager Soup and a Little Ball of Fib Airs December 12, 2019 at 8:00/7:00c on CBS Sheldon fakes being sick to avoid a swim test at school. Also, Dr. Sturgis spies on Meemaw's new boyfriend. Wallace Shawn and Craig T. Nelson guest star.

Season 3, Episode 15 - A Boyfriend's Ex-Wife and a Good Luck Head Rub Airs February 13, 2020 at 8:00/7:00c on CBS Meemaw meets Dale's ex-wife, June (Reba McEntire). Also, Sheldon is forced to work on a group project with reluctant college students. Reba McEntire, Wallace Shawn and Craig T. Nelson guest star.

Season 3, Episode 14 - A Slump, a Cross and Roadside Gravel Airs February 6, 2020 at 8:00/7:00c on CBS Sheldon and Georgie mine for platinum in roadside gravel. Also, Mary is concerned when Missy misuses religion to help with a batting slump. Craig T. Nelson returns as Coach Dale.

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.

Season 3, Episode 12 - Body Glitter and a Mall Safety Kit Airs January 16, 2020 at 8:00/7:00c on CBS Sheldon learns to listen when an emotional Paige (Mckenna Grace) struggles with her parents’ divorce. Also, George Sr. is furious when Georgie tries to buy his way out of chores. Wallace Shawn, Wyatt McClure, Mckenna Grace and Andrea Anders guest star. Lea Thompson (Back to the Future, Caroline in the City) directed this episode.

Season 3, Episode 13 - Contracts, Rules and a Little Bit of Pig Brains Airs January 30, 2020 at 8:00/7:00c on CBS George Sr. and Georgie go camping with Meemaw's new boyfriend, Dale (Craig T. Nelson), but things get complicated when her ex-boyfriend, Dr. Sturgis (Wallace Shawn), tags along.

'The Proposal Proposal' - Season 11, Episode 1 Airs Monday, September 25 at 8/7c on CBS. Amy gives Sheldon an answer to his proposal while Howard and Bernadette struggle with some unexpected news, on the 11th season premiere.

'The Hot Tub Contamination' - Season 10, Episode 5 Airs Monday, October 17 at 8/7c on CBS. Leonard and Penny must separate a quarreling Sheldon and Amy when their cohabitation does not go as planned, and Sheldon threatens to break off their relationship when Amy refuses to adhere to the bathroom schedule. Also, Howard and Bernadette find unexpected guests at their house when they decide to stay home from a planned vacation.

Season 3, Episode 11 - A Live Chicken, a Fried Chicken and Holy Matrimony Airs January 9, 2020 at 8:00/7:00c on CBS George Sr. and Meemaw struggle to manage the Cooper household while Mary plans Pastor Jeff's wedding. Melissa Peterman guest stars as Brenda Sparks.

'The Bow Tie Asymmetry' - Season 11, Episode 24 Airs Thursday, May 10 at 8/7c on CBS. When Amy's parents and Sheldon's family arrive for the wedding, everybody is focused on making sure all goes according to plan - everyone except the bride and groom. Kathy Bates, Mark Hamill, Teller, Laurie Metcalf, John Ross Bowie, Wil Wheaton, Brian Posehn, Jerry O'Connell, Courtney Henggeler and Lauren Lapkus guest star.

Season 3, Episode 6 - A Parasol and a Hell of an Arm Airs November 7, 2019 at 8:00/7:00c on CBS A church carnival leads Missy to try out for the baseball team. Also, Meemaw struggles after her breakup with Dr. Sturgis. Craig T. Nelson and Wallace Shawn guest star.

'The Long Distance Dissonance' - Season 10, Episode 24 Airs Thursday, May 11 at 8/7c on CBS. The gang is concerned when Sheldon's former admirer, Dr. Ramona Nowitzki (Riki Lindhome), resurfaces while Amy is away at Princeton. Rate This Episode

Season 3, Episode 9 - A Party Invitation, Football Grapes and an Earth Chicken Airs December 5, 2019 at 8:00/7:00c on CBS Mary gets Pastor Jeff involved when Sheldon isn't invited to Billy's birthday party. Also, George Sr. has "male-bonding time" with Dr. Sturgis. Wallace Shawn and Melissa Peterman guest star.