Casting News: Bob Newhart to Guest Star
Posted on Mar 21, 2013 10:45am

From TV Line: Marking his first half-hour sitcom appearance in nearly a decade, comedy legend Bob Newhart will guest star on The Big Bang Theory this May, TVLine has learned exclusively.

The six-time Emmy nominated star of The Bob Newhart Show and Newhart will play "Professor Proton," the former host of Sheldon's favorite science show as a kid.

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