Donald P. Bellisario Creator Don McGill Creator 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 Caleb Alexander Smith USNPS ISB Special Agent Gage Winchester Guest Star Norman Lehnert Greg Patrick Walsh Guest Star Michael Petrone Camping Guide Carl Guest Star Nicola Posener Maxine Lautner Guest Star Tiffany Dion Eye Roll Girl Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Mark Harmon Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer Scott Williams Executive Producer Chad Gomez Creasey Writer William Webb Director