11 Famous Actors Were Considered to Play Gibbs on 'NCIS' Before Mark Harmon (There Are 2 Oscar Winners On The List!)

It’s hard to imagine about anyone other than Mark Harmon playing the role of Special Agent Leroy Jethro Gibbs on NCIS, but he almost didn’t play the role! The 72-year-old actor played the iconic character on the JAG spinoff series for 19 seasons, becoming the second to last original series regular to depart the show.