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Bob Newhart guest stars on 'The Big Bang Theory'

Kaley Cuoco, Kunal Nayyar and Johnny Galecki on

Kaley Cuoco, Kunal Nayyar and Johnny Galecki on "The Big Bang Theory." Credit: CBS

Not often that a TV legend of the magnitude of Bob Newhart turns up on TV's most viewed comedy so when he does, attention must be paid: Professor Proton - host of Sheldon and Leonard's fave childhood TV show - arrives tonight:

  

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