Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor Brian Dietzen Dr. Jimmy Palmer Actor Emily Wickersham Probationary NCIS Agent Eleanor "Ellie" Bishop 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 Lindsay Wagner Barbara Bishop Guest Star Ryan Doom George Bishop Guest Star Patricia Bethune Paulette Quinn Guest Star Grantham Coleman Richard Doogan Guest Star Harry Van Gorkum Alton Brinkman Guest Star Jack Mikesell Navy Lt. Alex Quinn Guest Star Stuart McLean Malcolm Turro Guest Star Eric Nelsen Sean Quinn Guest Star Scott Roe Marine Guest Star Gary Glasberg Executive Producer 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 Jennifer Corbett Writer Arvin Brown Director