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, Director Gary Cole FBI Special Agent Alden Parker Actor Melina Kanakaredes Eleni Kostakis Guest Star Zane Holtz Special Agent Sawyer Guest Star Donna Mills Wanda Prescott Guest Star LL Cool J Sam Hanna Guest Star Steven D. Binder Executive Producer, Writer David J. North Executive Producer Chas. Floyd Johnson Executive Producer Mark Harmon Executive Producer Scott Williams Executive Producer, Writer Christopher J. Waild Executive Producer, Writer Mark R. Schilz Executive Producer Sydney Mitchel Writer Marco Schnabel Writer Matthew Lau Writer Lionel Coleman Director Diana Valentine Director José Clemente Hernandez Director Michael Zinberg Director