
Naval Criminal Investigative Service Special Agent Leroy Jethro Gibbs leads a group of colorful personalities in investigating crimes -- ranging from murder and espionage to terrorism -- that have evidence connected to Navy and Marine Corps personnel. The team includes MIT graduate Timothy McGee, Ellie Bishop, who specializes in international threat assessment, charismatic and unpredictable Nick Torres, and forensic psychologist Jack Sloane. Dr. Donald "Ducky" Mallard brings his vast experience in forensics into play to help solve cases.

The lives of the team members are in danger when they discover the identity of the Port-to-Port killer.

An investigation begins after a contract assassin targets a Navy lieutenant commander; information about Abby's family emerges after tests for a kidney donation.

The team searches an abandoned cargo vessel for a killer after a coast guard officer is gunned down; McGee and Tony search for Gibbs' perfect match.

Evidence reveals that a Navy lieutenant was killed by being force-fed too much liquid; Gibbs meets Ducky's new romantic interest (Cheryl Ladd).