Kunal Nayyar, Johnny Galecki, Jim Parsons, Simon Helberg Photo

From: Photo Flash: First Look - Bob Newhart Guest Stars on THE BIG BANG THEORY, 5/2

On THE BIG BANG THEORY's upcoming episode, titled 'The Proton Resurgence,' Sheldon and Leonard hire Professor Proton (guest star Bob Newhart), the host of their favorite childhood TV show, to perform. Also, Howard and Bernadette run into trouble babysitting Raj's dog, on THE BIG BANG THEORY, Thursday, May 2 (8:00 - 8:31 PM, ET/PT) on CBS.