Sheldon played by Jim Parsons, right,  and Leonard hire Professor Proton, played by guest star Bob Newhart, left, the host of their favorite childhood TV show, to perform, on "The Big Bang Theory," Thursday, May 2 on the CBS Television Network.
Sheldon played by Jim Parsons, right, and Leonard hire Professor Proton, played by guest star Bob Newhart, left, the host of their favorite childhood TV show, to perform, on "The Big Bang Theory," Thursday, May 2 on the CBS Television Network.
Sheldon played by Jim Parsons, right, and Leonard hire Professor Proton, played by guest star Bob Newhart, left, the host of their favorite childhood TV show, to perform, on "The Big Bang Theory," Thursday, May 2 on the CBS Television Network.

Bob Newhart visits ‘The Big Bang Theory’

May 01, 2013 8:00 PM