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!
In the episode, Sheldon feels slighted when Professor Proton seeks advice from Leonard instead of him, and he seeks Revenge by befriending a rival science TV host, Bill Nye. Meanwhile, Raj gets jealous when Howard crashes "girls' night," on THE BIG BANG THEORY, Thursday, Nov. 7 (8:00 - 8:31 PM, ET/PT) on CBS.
Photos: Monty Britnon/CBS

Johnny Galecki, Mayim Bialik, Jim Parsons and Bob Newhart

Kaley Cuoco, Simon Helberg, Melissa Rauch and Mayim Bialik

Bill Nye, Johnny Galecki, Bob Newhart

Bill Nye, Johnny Galecki, Bob Newhart

Jim Parsons, Bill Nye, Bob Newhart and Johnny Galecki
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