“The BIG BANG THEORY,” (CBS) 8 p.m.: Sheldon (Jim Parsons) goes head-to-head with Wil

“The BIG BANG THEORY,” (CBS) 8 p.m.: Sheldon (Jim Parsons) goes head-to-head with Wil Wheaton for the role of the new Professor Proton (Bob Newhart) as the show returns to its regular day and time.

“Young Sheldon,” (CBS) 8:30 p.m.: To appease his mother, Sheldon (Iain Armitage) employs the techniques of a self-help book to try and make a friend.

TV listings, D3