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Season 4, Episode 18 - The Wild and Woolly World of Nonlinear Dynamics Airs May 13, 2021 at 8:00/7:00c on CBS Missy's first heartbreak triggers a series of events that lead the Cooper family to the brink. Melissa Peterman guest stars.

Season 4, Episode 17 - A Black Hole Airs May 6, 2021 at 8:00/7:00c on CBS The Coopers discuss the possibilities of black holes and alternate universes when Dr. Sturgis comes over for dinner. Wallace Shawn and Wendie Malick guest star.

Season 4, Episode 16 - A Second Prodigy and the Hottest Tips for Pouty Lips Airs April 29, 2021 at 8:00/7:00c on CBS Sheldon finds himself at odds with Paige (Mckenna Grace) once again when she considers enrolling at East Texas Tech. Also, Mary seeks June’s (Reba McEntire) advice when looking for a change.

Season 4, Episode 13 - The Geezer Bus and a New Model for Education Airs April 8, 2021 at 8:00/7:00c on CBS Sheldon refuses to ride in a car after getting into an accident with Meemaw. Also, Missy uses their trauma to her advantage at school and Meemaw is forced to take the church shuttle while her car is in the shop.

Season 4, Episode 14 - Mitch's Son and the Unconditional Approval of a Government Agency Airs April 15, 2021 at 8:00/7:00c on CBS When the IRS accuses Sheldon of making a mistake, he’ll stop at nothing to prove them wrong. Also, Dale is forced to get a colonoscopy and tries to convince Meemaw to join him.

Season 4, Episode 7 - A Philosophy Class and Worms That Can Chase You Airs February 11, 2021 at 8:00/7:00c on CBS Sheldon’s first day of college is derailed by his new philosophy teacher, Professor Ericson (Melanie Lynskey). Also, Mary and Brenda (Melissa Peterman) live vicariously through Missy’s first day of middle school. Ed Begley, Jr. and Melanie Lynskey guest star.

Season 4, Episode 12 - A Box of Treasure and the Meemaw of Science Airs April 1, 2021 at 8:00/7:00c on CBS Sheldon, Dr. Linkletter and Meemaw team up on a science experiment. Also, Mary is jealous that Pastor Jeff and Brenda (Melissa Peterman) are spending time together, and Georgie has a new side hustle.

Season 4, Episode 11 - A Pager, a Club and a Cranky Bag of Wrinkles Airs March 11, 2021 at 8:00/7:00c on CBS Dr. Linkletter (Ed Begley, Jr.) pushes Sheldon to make friends with his fellow students at college. Also, Georgie gets a pager. Reba McEntire, Ed Begley, Jr. and Craig T. Nelson guest star.

Season 4, Episode 10 - Cowboy Aerobics and 473 Grease-Free Bolts Airs March 4, 2021 at 8:00/7:00c on CBS Sheldon campaigns to become Dr. Linkletter’s (Ed Begley, Jr.) lab assistant. Also, Georgie enlists the help of Mr. Lundy (Jason Alexander), the drama teacher, for a surprising business venture. Jason Alexander and Ed Begley, Jr. guest star.

Season 4, Episode 9 - Crappy Frozen Ice Cream and an Organ Grinder's Monkey Airs February 25, 2021 at 8:00/7:00c on CBS Sheldon and George Sr. dine with President Hagemeyer (Wendie Malick) and a university benefactor. Also, Georgie gives Missy some brotherly advice when Mary won’t let her go to the school dance, and Dale and June (Reba McEntire) convince Meemaw to attend their son’s wedding. Wendie Malick (Just Shoot Me!, Hot in Cleveland) guest stars. Craig T. Nelson and Reba McEntire return.

Season 4, Episode 8 - An Existential Crisis and a Bear That Makes Bubbles Airs February 18, 2021 at 8:00/7:00c on CBS Meemaw takes matters into her own hands when Sheldon's philosophy teacher, Professor Ericson (Melanie Lynskey), sends him into a tailspin. Also, George Sr. learns Georgie has been cutting class. Wallace Shawn, Ed Begley, Jr. and Melanie Lynskey guest star.

Season 4, Episode 6 - Freshman Orientation and the Inventor of the Zipper Airs January 21, 2021 at 8:00/7:00c on CBS College orientation does not go as Sheldon planned. Also, Mary is invited to a party when she’s mistaken for a university student, and George Sr. helps Pastor Jeff set up a children’s nursery. Wallace Shawn, Melissa Peterman and Wyatt McClure guest star.

Season 4, Episode 5 - A Musty Crypt and a Stick to Pee On Airs December 17, 2020 at 8:00/7:00c on CBS Dale and Meemaw work out relationship issues while playing Dungeons and Dragons with Sheldon and Missy. Also, Mary and George take a trip with Coach Wilkins (Doc Farrow) and his wife, and Georgie freaks out when his girlfriend thinks she’s pregnant. Craig T. Nelson guest stars as Dale.

Season 4, Episode 4 - Bible Camp and a Chariot of Love Airs December 3, 2020 at 8:00/7:00c on CBS Sheldon finds himself in a fierce competition with Paige when their mothers force them to attend Vacation Bible School. Also, George is furious after Georgie makes a questionable purchase. Craig T. Nelson and Mckenna Grace guest star.

Season 4, Episode 2 - A Docent, A Little Lady and a Bouncer Named Dalton Airs November 12, 2020 at 8:00/7:00c on CBS Sheldon gets a summer job at the local train museum. Also, George and Missy bond when Missy embarks on a new stage of womanhood, and Georgie discovers Mary's guilty pleasure.

Season 4, Episode 1 - Graduation Airs November 5, 2020 at 8:00/7:00c on CBS After graduating high school, Sheldon has a breakdown when he realizes he may not be ready for college. Also, Dale tries to make amends with Meemaw. Wallace Shawn and Craig T. Nelson guest star.

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