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 Katie Leclerc Marine Staff Sergeant Diana Murphy Guest Star William R. Moses Edison Geary Guest Star David Burke George Ingram Guest Star Peter Graham Christopher Crane Guest Star Amir M. Korangy Professor Zahir Najjar Guest Star Adam William Zastrow Ronald Kepczak Guest Star Timothy Hornor Ian Guest Star Danny Brown Sophie Guest Star Mo Beatty Payload Operator 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 Lisa Di Trolio Writer William Webb Director