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 Pam Dawber Marcie Warren Guest Star William Allen Young U.S. Secretary of Defense Moses McClaine Guest Star Victoria Platt NCIS Special Agent Veronica "Ronnie" Tyler Guest Star Zane Holtz NCIS Special Agent Dale Sawyer Guest Star Andrew Pifko Miles Thatcher Guest Star Connie Jackson Elaine Guest Star Daniel Peera Nasser Al-Kamal Guest Star Paolo Andino Arthur Guest Star Kamel Haddad Yemeni Foreign Affairs Minister Guest Star Brick Jackson Little Pinky Guest Star Preston Butler III Kendle Spotnitz 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