Co-created by the famous Donald P. Bellisario alongside Don McGill as spin-off of the series JAG, NCIS is a police procedural drama revolving around a fictional team of special agents working for the Naval Criminal Investigative Service (hence the 'NCIS' title), an organization set up to investigate crimes involving the United States Navy and Marine Corps. Members of the team include Agency Directors Jenny Shepard and Leon Vance, Special Agent in Charge Leroy Gibbs, Senior Special Agent Anthony DiNozzo, Special Agents Caitlin Todd and Ziva David, Junior Special Agent Timothy McGee, gothic Forensic Specialist Abby Sciuto, and Medical Examiners Donald "Ducky" Mallard and Jimmy Palmer.