“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” ...

Thanks to his role on "NCIS" and others, Mark Harmon is a legit star in his own right. But he also comes from a family of ...