Big Bang Theory Exclusive: Bob Newhart Set to Make Third Appearance as Professor Proton

The Proton DisplacementBob Newhart and The Big Bang Theory can’t get enough of each other.

The veteran actor is set to reprise his Emmy-winning role as Sheldon and Leonard’s childhood idol Professor Proton later this season, TVLine has learned exclusively.

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This will mark Newhart’s third Big Bang appearance, following his inaugural stint last season and his encore this past November.

There’s no word what brings the professor (aka Arthur Jeffries, Ph.D.) back into the fold.

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