
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 tracks down one of Parsa's cohorts by using evidence from the drone attack; McGee remains emotionally shaken.

With Special Agent Alden Parker still on the run with his ex-wife, the team investigates who from his past might have a personal vendetta against him in hopes of clearing Parker's name.

A port authority officer's murder reveals a possible location for Parsa; Bishop reveals a past connection to the terrorist.

NCIS agents from Washington, D.C., Los Angeles and Hawaii, in D.C. to attend the retirement party of a beloved Federal Law Enforcement Training Center professor, find themselves investigating his shocking suicide.