'NCIS' 450th Episode Celebrates Mark Harmon's Tenure & Producer Opened Up About Gibbs' Possible Return

'NCIS' Cast Credits Mark Harmon for Having Led Franchise With 'Integrity' Amid 450 Episodes (Exclusive)

NCIS Star Diona Reasonover Says Mark Harmon Still Comes To The Set & Loved The Script She Wrote For Tonight's Episode

Mark Harmon Removed From NCIS Opening Credits Nearly a Year After Exit