11 Actors Were Considered to Play Gibbs on 'NCIS' Before Mark Harmon Was Cast (Including Two Oscar Winners!)

NCIS legend Mark Harmon glows after a trip to LA post office as fans shower him with mail after highly anticipated return to franchise spin-off

How Did Mark Harmon Return to 'NCIS' for 'Origins' Crossover After His Exit?

When Is the 'NCIS'-'NCIS: Origins' Crossover Airing? Episode Date, Details & Teasers Revealed for Mark Harmon's Return as Gibbs!