March 21, 2013 at 2:43 PM ET
"The Big Bang Theory" is about to get even funnier: Legendary comedian Bob Newhart is guesting on the CBS sitcom this May!
As TVLine first reported, Newhart is playing Sheldon's childhood hero, Professor Proton, the host of a science show.
"Big Bang" producers Bill Prady and Steven Molaro teased the exciting casting news to The Clicker a few weeks ago at their sitcom's PaleyFest event.
"We have a really great actor coming up," said Prady, pointing out that unlike Wil Wheaton, Steven Hawking or Katee Sackhoff, for example, "he's not from the world of science or science fiction."
"The part he's going to play is someone (Sheldon and Leonard) loved when they were kids," added Molaro. "We're really excited about it."
No one is more excited than Sheldon (Jim Parsons)! When he finds out the fictional version of "Bill Nye the Science Guy" is now a professional party circuit celebrity, he hires him to join the gang at Casa Cooper.
To see Newhart -- and his famous deadpan delivery -- tune in to "The Big Bang Theory" Thursday, May 2 on CBS.
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