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'The Celebration Reverberation' - Season 11, Episode 11 Airs Thursday, December 14 at 8/7c on CBS. Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishment.

The Scavenger Vortex – When the entire gang competes in a scavenger hunt designed by Raj, it brings out the best – and worst – in everyone, on THE BIG BANG THEORY, Thursday, Oct. 3 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network.

"The Hofstadter Insufficiency" and "The Deception Verification" – Sheldon and Penny share intimate secrets while Leonard is away at sea, later, Sheldon’s feelings are crushed when Leonard returns. Meanwhile, Raj gets consoled about his ex-girlfriend and Wolowitz’s relationship with his mother causes an unusual threat to his masculinity, on a special one hour of the seventh season premiere of THE BIG BANG THEORY Thursday, Sept. 26 (8:00 – 9:01 PM, ET/PT) on the CBS Television Network. Regina King returns as Mrs. Davis, the University’s Director of Employee Relations, and Kevin Sussman returns as Stuart, the comic book store owner.

'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.

Season 5, Episode 13 - A Lot of Band-Aids and the Cooper Surrender Airs January 27, 2022 at 8:00/7:00c on CBS Sheldon makes friends with his dorm neighbors. Also, George Sr. learns his job is in jeopardy.

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 Solo Oscillation' - Season 11, Episode 13 Airs Thursday, January 11 at 8/7c on CBS. When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Also, Bert the geologist replaces Wolowitz in the band Footprints on the Moon, and Sheldon finds Penny a surprising source of scientific inspiration.

'The Line Substitution Solution' - Season 9, Episode 23 Airs Thursday, May 5 at 8/7c on CBS. Sheldon hires Stuart to spend the day with Amy when he'd rather go to a movie screening. Also, Leonard's mother, Beverly, comes to town and Penny struggles to make a connection with her. Rate This Episode

'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 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 6, Episode 2 - Future Worf and the Margarita of the South Pacific Airs October 6, 2022 at 8:00/7:00c on CBS Sheldon and Missy try to help the family’s finances. Also, Mary struggles to find her footing without the church. Ed Begley, Jr., Melissa Peterman and Dan Byrd guest star.

Season 6, Episode 4 - Blonde Ambition and the Concept of Zero Airs October 20 at 8:00/7:00c on CBS Sheldon makes a terrifying mathematical discovery while tutoring Billy. Also, Mary is jealous of Missy's relationship with Mandy and MeeMaw. Wallace Shawn (Dr. Sturgis), Ed Begley, Jr. (Dr. Linkletter), Melissa Peterman (Brenda Sparks) and Wyatt McClure (Billy Sparks) guest star in the episode.

Season 6, Episode 3 - Passion's Harvest and a Sheldocracy Airs October 13 at 8:00/7:00c on CBS Sheldon must choose sides in an ethical dilemma. Also, Mary tries her hand at writing and Mandy needs a new place to live.

Season 6, Episode 1 - Four Hundred Cartons of Undeclared Cigarettes and a Niblingo Airs September 29, 2022 at 8:00/7:00c on CBS George Sr. bails Meemaw and Georgie out of jail. Also, Sheldon and Missy meet Mandy (Emily Osment), and Mary feels unwelcome at church. Craig T. Nelson and Emily Osment guest star.

Season 5, Episode 22 - A Clogged Pore, a Little Spanish and the Future Airs May 19, 2022 at 8:00/7:00c on CBS Sheldon struggles to cope with the first signs of puberty. Also, Mary and George Sr. hunt for new jobs, and Georgie and Meemaw take a business trip across the border, on the fifth season finale of YOUNG SHELDON. Ed Begley, Jr. (Dr. Linkletter), Melissa Peterman (Brenda), Doc Farrow (Coach Wilkins), Rex Linn (Principal Petersen) and Wendie Malick (President Hagemeyer) all reprise their roles in the episode. Magicians Penn Jillette and Teller guest star in the episode.

'The Sales Call Sublimation' Season 9, Episode 12 Airs Thursday, January 7 at 8/7c on CBS. Penny gets more than she bargained for when Leonard agrees to meet with a psychiatrist (Jane Kaczmarek) on her behalf. Also, Sheldon and Koothrappali collaborate on an astronomical discovery, and Wolowitz and Bernadette can’t believe what they are feeling after Stuart moves out. Rate this episode

Season 5, Episode 17 - A Solo Peanut, a Social Butterfly and the Truth Airs March 31, 2022 at 8:00/7:00c on CBS Sheldon gets an odd request from an old friend, Paige (McKenna Grace). Also, George Sr. and Mary are caught in the middle of Meemaw and Dale's breakup, and Georgie comes clean to Mandy. Craig T. Nelson (Dale), McKenna Grace (Paige) and Emily Osment (Mandy) guest star in the episode.

'The Friendship Turbulence' - Season 7, Episode 17 Airs Thursday, March 6 at 20:00 on CBS. After the insults fly, Bernadette tries to broker the peace between Wolowitz and Sheldon. Meanwhile, Penny is offered an embarrassing movie role and Raj asks Amy to write to a woman on his behalf. Spoilers: Please only post about storylines which have been revealed in the episode's press release and subsequent promos. Discussion of other plot points should remain in the spoiler threads until the episode has aired.

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.

Season 5, Episode 20 - Uncle Sheldon and a Hormonal Firecracker Airs April 28, 2022 at 8:00/7:00c on CBS Sheldon and Missy learn about Georgie's pregnancy, and the whole family promises to keep it a secret. Matt Hobby (Pastor Jeff), Ed Begley, Jr. (Dr. Linkletter), Dan Byrd (Pastor Rob), Doc Farrow (Coach Wilkins) and Grady Lee Richmond (Wade) all reprise their roles in the episode.

Season 5, Episode 21 - White Trash, Holy Rollers and Punching People Airs May 12, 2022 at 8:00/7:00c on CBS As the church congregation gossips about Georgie, Missy stands up for her brother, and Sheldon is distracted by the family drama.

Season 2, Episode 20 - A Proposal and a Popsicle Stick Cross Airs May 2, 2019 at 8:30/7:30c on CBS Georgie is thrilled when Veronica (Isabel May) stays at the Coopers’ house for a few days. Also, Meemaw and Dr. Sturgis (Wallace Shawn) celebrate their one-year anniversary.

Season 5, Episode 18 - Babies, Lies and a Resplendent Cannoli Airs April 14, 2022 at 8:00/7:00c on CBS Sheldon copes with the death of a hero. Also, Missy wants to babysit, and Georgie struggles with his big secret. Wallace Shawn (Dr. Sturgis), Ed Begley, Jr. (Dr. Linkletter), Craig T. Nelson (Dale) and Emily Osment (Mandy) guest star in the episode.

Season 5, Episode 19 - A God-Fearin' Baptist and a Hot Trophy Husband Airs April 21, 2022 at 8:00/7:00c on CBS George and Mary insist on meeting the new woman in Georgie's life. Also, Sheldon and Missy have suspicions about what's going on with their family. Melissa Peterman, Wyatt McClure and Emily Osment return in the episode.

Season 5, Episode 15 - A Lobster, an Armadillo and a Way Bigger Number Airs March 3, 2022 at 8:00/7:00c on CBS Sheldon joins Dr. Linkletter (Ed Begley, Jr.) and Dr. Sturgis (Wallace Shawn) on a science road trip. Also, Georgie continues to lie about his age. Ming-Na Wen (E.R., The Book of Boba Fett) guest stars in this episode as Dr. Lee. Wallace Shawn, Ed Begley, Jr. and Wendie Malick return.