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 David McCallum Dr. Donald "Ducky" Mallard Actor Gary Cole FBI Special Agent Alden Parker Actor Stepfanie Kramer Sandra Holdren Guest Star Holly Curran Ruby Holdren Guest Star Matthew Hancock Geoffrey Sullivan Guest Star Todd Waring Albert James "Jamie" Beck Guest Star Danielle Larracuente Navy Petty Officer Third Class Maria Gonzalez Guest Star Andrea Forrest Navy Petty Officer Third Class Scott Dickerson 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 Kimberly-Rose Wolter Writer David J. North Writer Leslie Libman Director