Original air date: 09/25/2017 Runtime: 20:36 min. In the eleventh season premiere, Amy gives Sheldon an answer to his proposal, while Howard and Bernadette struggle with some unexpected news. LAURIE METCALF returns as Sheldon’s mother, Mary; RIKI LINDHOME returns as Ramona; and STEPHEN HAWKING returns as Himself.
Original air date: 10/02/2017 Runtime: 21:16 min. Leonard angers the university – and the entire physics community – after he gives an embarrassing interview. Also, Amy and Bernadete bond over having to hide their success from Sheldon and Howard. NPR Host IRA FLATOW returns as himself, and REGINA KING returns as Mrs. Davis.
Original air date: 10/09/2017 Runtime: 20:21 min. As Sheldon stresses out about picking a wedding date, Amy tries to convince him that he has a more laid-back side by recording him talking in his sleep. Meanwhile Raj and Stuart (series regular KEVIN SUSSMAN) compete to win the heart of Bernadette’s new coworker, Ruchi (guest star SWATI KAPILA).
Original air date: 10/16/2017 Runtime: 20:46 min. Howard and Sheldon bond over their relationships with their disappointing fathers when they drive to the desert to shoot off a model rocket. Meanwhile, it rubs Leonard the wrong way when his mom (CHRISTINE BARANSKI) finds a new best friend in Penny.
Original air date: 11/16/2017 Runtime: 18:50 min. Leonard and Howard are furious when they learn that Sheldon went to work with the military behind their backs. While Bernadette is on bed rest, she asks Raj go investigate when she suspects Ruchi might be trying to steal her job. Guest star DEAN NORRIS returns as Colonel Williams.
Original air date: 01/11/2018 Runtime: 21:18 min. When Sheldon kicks Amy out to work solo, she and Leonard bond during a series of science experiments. Meanwhile, Bert, the geologist, replaces Howard in his band, “Footprints on the Moon,” and Sheldon finds Penny a surprising source of scientific inspiration.
Original air date: 01/18/2018 Runtime: 19:26 min. Raj finds himself in the middle of a domestic drama when he learns the woman he’s dating, Nell (guest star BETH BEHRS), has a very upset husband, Oliver (guest star WALTON GOGGINS). Also, when Sheldon rents his old room back for a quiet place to work, he drives Leonard crazy by being a model tenant.
Original air date: 03/29/2018 Runtime: 20:16 min. When Penny gets the opportunity to host BILL GATES (guest starring as himself) at work when his company wants to partner with her pharmaceutical company, Leonard, Howard and Raj do everything in their power to meet him, while Sheldon thinks he’s the victim of an April Fool’s prank.
Original air date: 04/12/2018 Runtime: 21:06 min. A brilliant, but reclusive scientist, Doctor Wolcott (guest star PETER MacNICOL) invites Sheldon to his cabin in the middle of nowhere, and Leonard, Howard and Raj go along for the trip. Penny and Bernadette improvise when Amy doesn’t like the tame bachelorette party they planned for her.