Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor Maria Bello NCIS Special Agent Jacqueline "Jack" Sloane Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Emily Wickersham NCIS Special Agent Eleanor "Ellie" Bishop Actor Brian Dietzen Dr. Jimmy Palmer Actor Duane Henry MI6 Officer Clayton Reeves Actor Rocky Carroll NCIS Director Leon Vance Actor, Director David McCallum Dr. Donald "Ducky" Mallard Actor Trevor Donovan Navy Cmdr. Thomas Buckner Guest Star Alberto De Diego Marine 1st Lt. Ethan Wynn Guest Star Andrew Puente Navy Petty Officer 3rd Class Joe Smiddy Guest Star Gates McFadden Constance Belmont Guest Star Andrew Asper Mitch Greyson Guest Star Alexis Stier Farrah Guest Star Megan Stier Sarah Guest Star Kent Shocknek Guy Ross Guest Star Jill Czarnowski NCIS Technician Ottsley Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer Scott Williams Executive Producer Donald P. Bellisario Executive Producer Jennifer Corbett Writer