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 Laura San Giacomo Grace Confalone Guest Star Mariela Garriga Maria Diaz AKA Anita Reyes Guest Star Joseph Melendez Reymundo Diaz Guest Star Armando Acevedo Rene "Renny" Romero Guest Star Kate Boyer U.S. Deputy Marshal Cindy Carter Guest Star Jarvis George U.S. Deputy Marshal John Wright Guest Star Chris Lamica Seller Guest Star Sean Samuels Buyer #1 Guest Star Christopher Alvarenga Buyer #2 Guest Star Clark Moore Virginia State Trooper Phil Collins Guest Star Brennan Keel Cook Travis Williams Guest Star George Paez Pablo Silva 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, Writer Brendan Fehily Writer Terrence O'Hara Director