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 Scott William Winters CIA Officer Westley Clark Guest Star Suzanne Savoy Rachel Brentwood Guest Star Justin Welborn John Zaprowski Guest Star Sal Landi Bill Zaprowski Guest Star Kirk Fox Rod Carmale Guest Star Rhomeyn Johnson Trucker Al Guest Star Will Finley Adam Neil Guest Star Todd Anthony Navy Lieutenant Connor Reese Guest Star DawnMarie Ferrara Trucker 1 Guest Star Marla Gibbs Rosie Brown Guest Star Peter S. Kim Dracula Clark 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 Scott J. Jarrett Writer Matthew R. Jarrett Writer