The Big Bang Theory

The Proton Resurgence
Bob Newhart's fans have been waiting for this one - his first appearance on The Big Bang Theory Thursday night (May 2).  Duly promoted as befits a sweeps-sized casting coup, Newhart has come aboard TV's highest-rated sitcom for at least three episodes, playing a "Mr. Wizard"- style kiddie science show host who's a childhood idol of Sheldon (Jim Parsons) and Leonard (Johnny Galecki).  When Sheldon learns that "Professor Proton" is available for appearances, he giddily books him for an engagement at their apartment.
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