NCIS (Naval Criminal Investigative Service) is more than just an action drama. With liberal doses of humor it's a show that focuses on the sometimes complex and always amusing dynamics of a team forced to work together in high-stress situations. NCIS Special Agent Leroy Jethro Gibbs (Mark Harmon) a former Marine gunnery sergeant whose skills as an investigator are unmatched formerly led this troupe of colorful personalities.