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"Bob Newhart has featured in a new clip from an upcoming episode of The Big Bang Theory. The TV comedy veteran stars as Professor Proton, a childhood hero of Sheldon&amp;#039;s (Jim Parsons), in the CBS sitcom.  Sheldon discovers that the professor is available for private engagements in the episode, while Leonard (Johnny Galecki) is also excited to meet a science idol, reveals The Hollywood Reporter. Newhart&amp;#039;s episode will be broadcast on Thursday, May 2 at 8pm on CBS. Parsons said of working with Newhart: &amp;quot;It was incomprehensible; you can&amp;#039;t comprehend what it is you&amp;#039;re doing. &amp;quot;We&amp;#039;ve had some great people on this set, but he was the first person that I had that feeling of, &amp;#039;I can&amp;#039;t believe you&amp;#039;re real&amp;#039;.&amp;quot; The 83-year-old comedy legend has appeared in a number of TV shows as a guest star in recent years, including NCIS, Desperate Housewives and ER. His most famous programmes were The Bob Newhart Show from 1972 to 1978 and later a second series titled Newhart from 1982 to 1990. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/the-big-bang-theory/news/a476414/big-bang-theory-bob-newhart-guests-as-sheldons-hero-video/>