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 Louise Barnes Sarah Guest Star Jack Fisher Phineas Guest Star Rick Overton Elmer Barlow Guest Star Tyler Francavilla Dustin Vanderschmitt Guest Star Sonya Leslie Nancy Guest Star Paul Norwood Jesse Gilyard Guest Star Reatha Grey Marion Guest Star Carter Mitchell Virgil Guest Star Briana Cuoco Rosalind Guest Star Serafina Polite Emma Guest Star Christopher Bencomo Navy Petty Officer First Class Ian Rojas 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 Christopher J. Waild Writer Terrence O'Hara Director