NCIS (Naval Criminal Investigative Service) is an action drama about a team of special agents whose mission is to investigate any crime that has a shred of evidence connected to Navy and Marine Corps personnel, regardless of rank or position. Leading this team and is independent of the Navy chain of command is NCIS agent Leroy Jethro Gibbs (Mark Harmon), an experienced investigator and interrogator who is smart, tough and willing to break the routine tasks.