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

'NCIS: Origins' TV Show Gives Present-Day Gibbs Update, Reveals Where Mark Harmon's Character Is Now

Mark Harmon Reveals the Huge Compliment Paid to Austin Stowell After His 'NCIS: Origins' Audition!

Mark Harmon ‘There to Help’ Behind Camera as 'NCIS' Prequel Producer