
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.

The team's investigation into a lieutenant's death is connected to a citywide blackout.

A showdown between the NCIS team and an elusive arms dealer reaches an explosive conclusion.

Ducky makes a startling discovery that leads to the search for a missing child; Tony struggles to deal with his feelings for Jeanne.

Gibbs and Lt. Col. Mann investigate the murder of a Marine captain who had access to highly classified information; a witness in the case turns out to be Gibbs' ex-wife.