Mark Harmon is most well-known for "NCIS," but the actor has been on a number of of highly-rated television series throughout his long career.
“NCIS” legend Mark Harmon is bringing his OG Leroy Jethro Gibbs character to the prequel series “NCIS: Origins,” and he’s not coming alone. Harmon, 74, will make a rare guest appearance on “Origins” ...
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