
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.

NCIS investigates the death of a ride-share driver who was found after a car accident; Parker's dad, who is temporarily living with him, assists the team in their investigation.

When an old pal of Torres' comes to him -- disheveled and bloodied -- for guidance amidst an undercover FBI operation and then disappears, NCIS helps track him down; McGee prepares to be a contestant on a popular game show.

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.