
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.

NCIS investigates the death of a man on a cruise ship whose body is discovered in the ship's sauna by McGee's mother-in-law.

Gibbs questions DiNozzo's ability to do his job when the elder DiNozzo gets involved in their latest investigation.

A Navy reservist's body is found in a beat-up car at the end of a gun range; Kasie weighs the pros and cons of buying a gun.

When an assassin targets the government's key witness in an embezzlement case, the team must help the witness make it home alive.