Stephen Hawking has reportedly filmed a 'Cameo' appearence on 'The Big Bang Theory."
The worlds most famous theoretical physcist will have a "run-in" with Sheldon , the scientist character played by Jim Parsons .
Their scene is reportedly part of the hit sitcom's April 5 episode according to TV Guide .
As it happens , Hawing's guest spot will come just one week after another icon , Leonard Nimoy , drops in on the CBS show .
In the past , Hawking has appeared ... as himself ... in animated series "The Simpsons" and "Futurama."
"The Big Bang Theory" has tried in the past to land him , but he'd reportedly been too ill .
The episode will air ... April 5 th ... CBS.
