The Big Bang Theory

CBS, 8 ET/PT

She may be getting buzz for her performance in Lady Bird, but Laurie Metcalf still has time to visit Big Bang as Sheldon’s mother, Mary. She shows up when Sheldon (Jim Parsons) kicks Amy (Mayim Bialik) out so he can get some work done on his own, giving Amy the opportunity to bond with Leonard (Johnny Galecki).

Sheldon’s mom (Laurie Metcalf) drops in on “Big Bang Theory.” MICHAEL YARISH/WARNER BROS.