Mark Harmon to Make a Cameo on 'NCIS: Origins'!

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

Mark Harmon Talks Handing Over Gibbs Role to Austin Stowell & Why He's 'Pleased' to Take Step Back on 'NCIS: Origins'

Mark Harmon Says He’s “Fine” Stepping Back On ‘NCIS: Origins’: “I’m Just There To Support”