"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 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.