VIDEO: Sneak Peek - Bob Newhart Guests on CBS's BIG BANG THEORY

On tonight's episode of CBS's THE BIG BANG THEORY titled 'The Proton Displacement, 'Sheldon feels slighted when Professor Proton (guest star Bob Newhart) 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." The episode airs tonight, Thursday, Nov. 7 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network. Get a sneak peek below!

Leonard and Sheldon are brilliant physicists – geniuses in the laboratory, but socially challenged everywhere else. Enter beautiful, street-smart neighbor, Penny, who aims to teach them a thing or two about life. Despite their on-again, off-again relationship in the past, Leonard believes he's found true love with Penny. Even Sheldon has found a female companion, entering into a "Relationship Agreement" with neurobiologist Amy Farrah Fowler. In their free time, Leonard and Sheldon continue to enjoy frequent trips to the comic book store and fantasy role-playing games with their ever-expanding universe of friends, including fellow scientists Koothrappali, Wolowitz and Wolowitz's adorable microbiologist wife, Bernadette.

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