He may be gone, but Special Agent Leroy Jethro Gibbs's rules live on. Mark Harmon, who played Gibbs, was one of the last original cast members left on NCIS, having been on the show since its first ...

Mark Harmon beat two Oscar winners to become NCIS’s Leroy Jethro Gibbs, turning the role into a TV legend over 19 seasons.

The series, which airs on CBS, also features Kyle Schmid as a young agent Mike Franks, a proud Texan patriot who befriends Gibbs and helped him to become an agent himself. It is a spin-off of NCIS ...