Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Jennifer Esposito NCIS Special Agent Alexandra "Alex" Quinn Actor Emily Wickersham NCIS Probationary Agent Eleanor "Ellie" Bishop Actor Brian Dietzen Dr. Jimmy Palmer Actor Duane Henry MI6 Officer Clayton Reeves Actor Rocky Carroll NCIS Director Leon Vance Actor David McCallum Dr. Donald "Ducky" Mallard Actor Joe Spano Senior FBI Agent T.C. Fornell Guest Star Laura San Giacomo Dr. Grace Confalone Guest Star Brandon Quinn Greg Abell Guest Star Nina Rausch Devon Hill Guest Star La Monde Byrd Marine Capt. Rand Kraus Guest Star Matthew Holmes Griffin Dorn Guest Star John Burke ICU Doctor Guest Star Andy Wagner Officer Cody Guest Star Marie Oldenbourg Marine Sgt. Erin Hill Guest Star Richard Wharton Squeegee Man Guest Star Gary Glasberg Executive Producer Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer, Writer George Schenck Executive Producer, Writer Steven D. Binder Executive Producer Scott Williams Executive Producer Donald P. Bellisario Executive Producer Ed Ornelas Director