Donald P. Bellisario Creator Don McGill Creator 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 Matthew Bellows Navy Captain Reginald Barkley Guest Star Arlene Santana Navy Chief of the Boat Constance Shaw Guest Star Tommy Walker Navy Petty Officer First Class Justin Hardy Guest Star James Ferris Navy Lieutenant Commander Gregory Pullman Guest Star Michele Boyd Navy Chief Petty Officer Emily Ross Guest Star Ransford Doherty Navy Seal Petty Officer Second Class Zachary Harper Guest Star Megan Gallagher Under Secretary of the Navy Jennifer Leo Guest Star Tracy Howe Navy Culinary Specialist Brian Kalr Guest Star Ethan Flower Fire Chief Alfonso Romero Guest Star Josh Trant Navy Chief of Watch Guest Star Mark Fite Walter Miller 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 Scott J. Jarrett Writer Matthew R. Jarrett Writer