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 Cliff Chamberlain Peter Buck Guest Star Frankie Jay Allison Vince Pierman Guest Star Ellen Geer Esther Daniels Guest Star Dylan Vox Lou Jinks Guest Star David DeLuise Michael Franklin Guest Star Tatiana Carr Sara Jones Guest Star David L. King Zullow Senior Vice President Lance Rama Guest Star Michael Dunn Lenny Dunstrop Guest Star Paulina Bugembe Military Police Officer Vera Armstrong 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, Writer Donald P. Bellisario Executive Producer Thomas J. Wright Director