Donald P. Bellisario Creator, Executive Producer Don McGill Creator Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer 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 Guest Star Zane Holtz NCIS Special Agent Dale Sawyer Guest Star Matt Angel Sammy a.k.a. Peter Samkharadze Guest Star Daeg Faerch Alex Russo Guest Star Alex Sparrow Maxim Dovhal Guest Star Sarah Chaney DIA Agent Collins Guest Star Montae Russell Maurine Lieutenant General Joseph Clark Guest Star Natasha Blasick Elena Dovhal Guest Star Marcus Ray Bouncer 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 David J. North Executive Producer Katherine Beattie Writer James Whitmore Jr. Director