''The Proton Displacement'' -- Sheldon feels slighted when Professor Proton (Bob Newhart) seeks advice from Leonard instead of him, and he seeks revenge by befriending a rival science TV host, Bill Nye, on THE BIG BANG THEORY, Thursday, Nov. 7 (8:00 �'ƒà Photo

From: Photo Flash: First Look at Bob Newhart's Return to THE BIG BANG THEORY

Bob Newhart makes his return to CBS' THE BIG BANG THEORY on the upcoming episode titled 'The Proton Displacement' - check out a first look below!