
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.
A murder victim turns out to have been living under an alias created for one of Gibbs' undercover cases from 20 years ago.
The team investigates the world of black market art when evidence in a murder case reveals that a rare painting has been swapped for a fake.
When a dead thief is found in a Marine's home, the NCIS team finds the calling card of a terror group the Department of Defense had been tracking.
After NCIS arrives at a Halloween crime scene, Torres recognizes the victim as a friend from federal law enforcement training; Jimmy thinks his lab is haunted by ghosts after objects keep mysteriously moving.