Sean Murray NCIS Special Agent Timothy McGee Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Brian Dietzen Dr. Jimmy Palmer Actor Diona Reasonover Forensic Scientist Kasie Hines Actor Katrina Law NCIS Special Agent Jessica Knight Actor Rocky Carroll NCIS Director Leon Vance Actor Gary Cole FBI Special Agent Alden Parker Actor David McCallum Dr. Donald "Ducky" Mallard Actor Maria Bello Special Agent Jacqueline "Jack" Sloane Actor Emily Wickersham NCIS Special Agent Eleanor "Ellie" Bishop Actor Jennifer Esposito NCIS Special Agent Alexandra "Alex" Quinn Actor Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Pauley Perrette Forensic Specialist Abby Sciuto Actor Duane Henry MI6 Officer Clayton Reeves Actor Cote de Pablo NCIS Special Agent Ziva David Actor Lauren Holly NCIS Director Jenny Shepard Actor Steven D. Binder Executive Producer David J. North Executive Producer Chas. Floyd Johnson Executive Producer Scott Williams Executive Producer Christopher J. Waild Executive Producer Mark R. Schilz Executive Producer