Special Agent Leroy Jethro Gibbs, an intelligent, highly skilled investigator and intimidating presence, leads a team of of special agents at the Naval Criminal Investigative Service (NCIS), 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. Working under Gibbs is Special Agent Anthony DiNozzo, a former homicide detective with instincts that come only from working on the streets, and forensics specialist Abby Sciuto, a gifted scientist whose dark wit matches her goth-style hair and clothes. Also assisting the NCIS team is medical examiner Dr. Donald "Ducky" Mallard, a man who's seen it all and tends to share a bit too much. Together, these special agents travel the globe to investigate all crimes with Navy or Marine Corps ties, from murder to terrorist threats to stolen submarines.