
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.

When a Marine known for his love of practical jokes is found dead on Halloween, the team is called in to investigate; they soon learn that his jokes may have been the reason why he was killed.

Gibbs must take desperate measures to protect his loved ones with Paloma Reynosa still on the loose.

A girl's kidnapping turns into something bigger when her grandfather complicates the investigation.

Gibbs and Fornell attempt to track down the leader of a drug ring who supplied drugs to Fornell's daughter; the team deals with the case of a missing cadaver from the NCIS autopsy room.