Instructions to change your password should arrive in your inbox in a few moments.
Sheldon and Leonard hire Professor Proton, the host of their favorite childhood TV show, to perform, on THE BIG BANG THEORY, Thursday, May 2nd on the CBS Television Network. Bob Newhart guest stars as Professor Proton. Pictured left to right: Kaley Cuoco, Bob Newhart, Jim Parsons and Johnny Galecki Photo: Michael Yarish/Warner Bros. ©2013 Warner Bros. Television. All Rights Reserved.