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, Director David McCallum Dr. Donald "Ducky" Mallard Actor Cote de Pablo Ziva David Guest Star Patrick Duffy Retired Navy Lieutenant Commander Jack Briggs Guest Star Jonathan Chase Navy Commander Marshall May Guest Star Jack Fisher Phineas Guest Star Louise Barnes Sarah Guest Star Usman Ally Victor Mir Guest Star Johnny Williams Carmen Lorenzo Guest Star Madeline Blake Navy Lieutenant Junior Grade Harper Logan Guest Star JB Tadena Navy Combat Information Center Officer Lonnie Franklin Guest Star Jeremy Denzlinger NCHP Colonel Bill Timmons Guest Star Phil Idrissi Big Lou Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer, Writer Scott Williams Executive Producer, Writer Donald P. Bellisario Executive Producer Gina Lucita Monreal Writer Brendan Fehily Writer Christopher J. Waild Writer Kate Torgovnick May Writer Michael Zinberg Director James Whitmore Jr. Director Tony Wharmby Director Tawnia McKiernan Director Diana Valentine Director