Bob Newhart reprising guest role on 'The Big Bang Theory'
Bob Newhart reprises his Emmy-winning guest role as Professor Proton/Arthur Jeffries, a former science TV show host turned children's party entertainer, on Thursday's episode of "The Big Bang Theory" (8 p.m., CBS/2). Here are five other notable TV guest appearances that Newhart, now 84, has done in his long TV career:
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