"The Decision Reverberation" -- Pictured: Anu (RatI Gupta) and Rajesh Koothrappali (Kunal Nayyar). Koothrappali is worried people won't take him seriously in his own field after publishing a paper that suggests he may have discovered alien life. Also, Leonard wants to be the principal investigator on a plasma physics study, on THE BIG BANG THEORY, Thursday, April 25 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2019 CBS Broadcasting, Inc. All Rights Reserved .

"The Inspiration Deprivation" -- Pictured: Leonard Hofstadter (Johnny Galecki), Sheldon Cooper (Jim Parsons), Amy Farrah Fowler (Mayim Bialik), Howard Wolowitz (Simon Helberg) and Rajesh Koothrappali (Kunal Nayyar). 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, on THE BIG BANG THEORY, Thursday, April 18 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Oscar-winning actress Regina King returns as Janine. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2019 WBEI. All rights reserved.

"The Donation Oscillation" -- Pictured: Marissa (Lindsey Kraft), Zack (Brian Thomas Smith), Penny (Kaley Cuoco) and Leonard Hofstadter (Johnny Galecki). 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," on THE BIG BANG THEORY, Thursday, Feb. 7 (8:00-8:31 PM, ET/PT) on the CBS Television Network. Keith Carradine returns as Penny's father, Wyatt. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2019 WBEI. All rights reserved.

"The Conjugal Configuration" - Pictured: Sheldon Cooper (Jim Parsons) and Amy Farrah Fowler (Mayim Bialik). Sheldon and Amy's honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy's parents, Mr. and Mrs. Fowler (Teller and Kathy Bates). Also, Koothrappali insults physicist Neil deGrasse Tyson and starts a Twitter war, on the 12th season premiere of THE BIG BANG THEORY, on a special night, Monday, Sept. 24 (8:00-8:30 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2018 WBEI. All rights reserved.