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 Maria Bello NCIS Special Agent Jacqueline "Jack" Sloane Actor Emily Wickersham NCIS Special 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. Fornel Guest Star Graham Hamilton Gabriel Hicks Guest Star Hilary Ward Jessica Shaeffer Guest Star Allen Maldonado Raymond Smith Guest Star Fran Bennett Mary Elaine Smith Guest Star Beau Billingslea Denny "Pop" Rydell Guest Star Todd Jeffries Thomas Gardiner Guest Star Penny Peyser Judge Susan Delphy Guest Star Brian Maierhofer Navy Lt. Edward O'Connell 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 Gina Lucita Monreal Writer Dennis Smith Director