
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.

In preparation for a role, a world-renowned actress shadows the NCIS team as they investigate a decapitation case.

Following a deadly attack, one member of the team reminisces.

Parker grapples with his emotions when a con man from his past turns up as a prime suspect in the murder of a navy officer.

A Naval petty officer and sole witness in an upcoming murder trial disappears.