via press release:
EMMY AWARD WINNER BOB NEWHART RETURNS AS PROFESSOR PROTON, ON “THE BIG BANG THEORY,” THURSDAY, NOV. 7
Bill Nye To Guest Star as Himself
Fresh off his Emmy Award win, Bob Newhart returns to THE BIG BANG THEORY as Professor Proton, Sheldon’s favorite childhood hero. In the episode, when Professor Proton (Newhart) contacts Leonard (Johnny Galecki) to ask for help with an experiment, a scorned Sheldon (Jim Parsons) seeks revenge by befriending a rival science TV host, Bill Nye, on THE BIG BANG THEORY, Thursday, Nov. 7 (8:00-8:31 PM, ET/PT) on the CBS Television Network.