Grab your goggles, put your lab coat on because Professor Proton is back! Bob Newhart will return to "The Big Bang Theory" next month, TVGuide.com has learned.
Newhart will reprise his role as Sheldon's childhood hero Arthur Jeffries, aka Professor Proton, in the Dec. 17 episode. The late Professor Proton will once again visit Sheldon (Jim Parsons) in his dreams as a Jedi to dispense advice and help him make a very important decision.
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