"The Big Bang Theory" is getting a visit from Stephen Hawking.

The renowned theoretical physicist will guest-star on the April 5 episode of the CBS comedy, the network said Monday. In the cameo, Hawking visits uber-geek Sheldon Cooper (Jim Parsons) at work "to share his beautiful mind with his most ardent admirer," according to CBS.

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Executive producer Bill Prady said that having Hawking on the show had long been a goal, though it seemed unattainable.

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When people would ask us who a ‘dream guest star’ for the show would be, we would always joke and say Stephen Hawking – knowing that it was a long shot of astronomical proportions,” Prady said. “In fact, we’re not exactly sure how we got him. It’s the kind of mystery that could only be understood by, say, a Stephen Hawking.”

Hawking, known for his book "A Brief History of Time," has appeared on television comedies before, albeit in voice work. Hawking has done a guest spot on "Futurama" and appeared as himself on several episodes of "The Simpsons."