After almost 20 seasons, Leroy Jethro Gibbs left NCIS. Mark Harmon may have left the show, but this isn't the end for Gibbs.

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

From courtrooms to covert missions and Southern jazz to Sydney harbors, the NCIS franchise is an expansive saga with ...