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‘NCIS’: Who’s in the Cast?

If you’re starting to watch NCIS, you might be curious about which actors star in the show. Here’s a rundown of the main NCIS cast members. Mark Harmon Mark Harmon plays the role of Leroy Jethro Gibbs. Harmon made his acting debut in a 1973 episode of the television show Ozzie’s Girls titled “The Candidate.” …