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 James MacDonald Navy Admiral Norton Padgett Guest Star Cassi Thomson Angie Gray Guest Star Jeff Pierre Lew Nolte Guest Star Miriam A. Hyman Lanny Peete Guest Star Patrick W. Day Phil Iverson Guest Star Susan Angelo Admiral's Wife Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer, Writer Steven D. Binder Executive Producer Scott Williams Executive Producer Donald P. Bellisario Executive Producer Terrence O'Hara Director