21 March 2013 1:29 PM, PDT | Zap2It - From Inside the Box | See recent Zap2It - From Inside the Box news »

A TV legend will be visiting "The Big Bang Theory" during May sweeps.

Bob Newhart will guest-star on an episode of the CBS hit scheduled for May 2. He'll play "Professor Proton," the former host of a science show Sheldon (Jim Parsons) loved as a kid, TVLine reports. It turns out Leonard (Johnny Galecki) also remembers him.

Sheldon learns that the Professor hires himself out for appearances and gets him to come to the guys' apartment.

More TV news and notes:

- NBC is resurrecting "The Sing-Off." The a cappella competition had a couple of fairly successful runs as a short-run show during the holidays but fizzled when the network made it a weekly series in 2011. The revived show will return to its original scheduling.

- David Anders ("Once Upon a Time") is joining John Stamos on USA's "Necessary Roughness" this summer. Anders will play the second-in-command at a talent agency »

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