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, Director David McCallum Dr. Donald "Ducky" Mallard Actor Gary Cole FBI Special Agent Alden Parker Actor Mike Erwin Sam Radner Guest Star Miki Ishikawa Molly Stoll Guest Star Randall Batinkoff Walt Freeman Guest Star Lauren Bowles Nance Freeman Guest Star J. Claude Deering Curtis Hubley Guest Star Tarina Pouncy Anne Crenshaw Guest Star Carlos Pratts Isaac Morales Guest Star Del Zamora Sergio Morales Guest Star Maya Boudreau Lola Morales 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 Katie White Writer