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 Laura San Giacomo Dr. Grace Confalone Guest Star Coby Ryan McLaughlin Pete Wilkins Guest Star A Leslie Kies Donna Coyne Guest Star Todd Giebenhain Leo Vairo Guest Star Amad Jackson Phil Proderman Guest Star Peggy Dunne Doris Tolchuck Guest Star Matt Knudsen Jensen Reed Guest Star Judy Kain Gladys Stone Guest Star Kristen O'Meara Lydia Smith Guest Star Jun Kim Navy Cmdr. Steve Nuali Guest Star Bo Youngblood Janis 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, Writer Donald P. Bellisario Executive Producer James Whitmore Jr. Director