urx unit loader 'The Big Bang Theory' snags Bob Newhart, 'The Sing Off' returns to NBC
bob-newhart-big-bang-theory-gi.jpgA 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 run by Stamos that tries to court Dani (Callie Thorne).

– Former “My Name Is Earl” star Nadine Velazquez is joining the cast of TNT’s “Major Crimes.” She plays a deputy district attorney assigned to the Phillip Stroh case who butts heads with Raydor (Mary McDonnell). “Major Crimes” begins its second season on June 10.

– FOX has added a couple more projects to its roster of limited-run series in developments. One is a remake of the highly rated 1980s miniseries “Shogun,” and the other is about the O.J. Simpson murder case, based on Jeffrey Toobin’s book “The Run of His Life.”

– “Doctor Who’s” Karen Gillan will soon be back on your TV as part of Adult Swim’s “NTSF:SD:SUV.” Part of the new season will involve the team investigating the (fake) British District of San Diego — and will film in the U.K.

– AMC has released a trailer for its new series “Low Winter Sun,” starring Mark Strong (“Sherlock Holmes,” “John Carter”) and Lennie James (“The Walking Dead”) as two Detroit cops involved in the murder of a fellow officer. It premieres in the summer. Take a look: