Spinning off from the popular TV series JAG, NCIS focuses on the Naval Criminal Investigative Service, a team that operates outside of the military chain of command. Leading the NCIS is Special Agent Jethro Gibbs (Mark Harmon), a highly-skilled investigator and interrogator who is smart, tough and willing to bend the rules to get the job done. Working under Gibbs are Special Agent Anthony DiNozzo (Michael Weatherly), Agent Caitlin "Kate" Todd (Sasha Alexander), and neophyte Agent Timothy McGee (Sean Murray). Ably assisted by forensics specialist Abby Sciuto (Pauley Perrette) and medical examiner Dr. Donald "Ducky" Mallard (David McCallum), the NCIS investigate all Navy and Marine related crimes from murder and espionage to terrorism and stolen submarines!