Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Sean Murray NCIS Special Agent Timothy McGee Actor Emily Wickersham NCIS Special Agent Eleanor "Ellie" Bishop Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Maria Bello Special Agent Jacqueline "Jack" Sloane Actor Brian Dietzen Dr. Jimmy Palmer Actor Diona Reasonover Forensic Scientist Kasie Hines Actor Rocky Carroll NCIS Director Leon Vance Actor David McCallum Dr. Donald "Ducky" Mallard Actor Patrick Duffy Retired Navy Lieutenant Commander Jack Briggs Guest Star Jonathan Chase Navy Commander Marshall May Guest Star Lyndon Smith Navy Lieutenant Rebecca Weeks Guest Star Chris Gann Navy Captain Henry Nikolai Guest Star Megan Gallagher Under Secretary of the Navy Jennifer Leo Guest Star Johnny Williams Carmen Lorenzo Guest Star Tom Ayers Bobby Dale Douglas Guest Star Madeline Blake Navy Lieutenant Junior Grade Harper Logan Guest Star JB Tadena Navy Combat Information Center Officer Lonnie Franklin Guest Star Jennifer Sun Bell Navy Air Traffic Controller Amelia Garcia Guest Star Jeremy Denzlinger NCHP Colonel Bill Timmons Guest Star Phil Idrissi Big Lou Guest Star Emilia Ares Layla Zolotov 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 Brendan Fehily Writer Tawnia McKiernan Director