Mona Lisa is the 18th episode of NCIS Season 16 and also the 372nd episode of the entire NCIS series.
Torres relies on his team's investigative skills after he wakes up on a dilapidated fishing boat, covered in blood and unable to remember the last twelve hours with the team later finding the body of a dead woman under Torres's bike and Torres soon realizing that it might be connected to a case he was part of concerning the seizure of uncut diamonds.
- Gibbs has yet to visit Ziva's private office since the last time they visited.
- It is revealed that Wesley Clark's spying on Leon Vance was extended in order to verify whether he could be trusted with investigating Secretary of Defense Crawford for embezzlement.
- In addition, Leon Vance deduced that his current date was spying on him.
- Mallard's Historian office has been fully created.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray||Senior Special Agent and second-in command of the NCIS Major Case Response Team.|
|Nicholas Torres||Wilmer Valderrama||Special Agent for the NCIS Major Case Response Team.|
|Eleanor Bishop||Emily Wickersham||Special Agent for the NCIS Major Case Response Team.|
|Jacqueline Sloane||Maria Bello||NCIS Forensic Psychologist.|
|James Palmer||Brian Dietzen||Chief Medical Examiner for the Major Case Response Team.|
|Kasie Hines||Diona Reasonover||NCIS Forensic Specialist; Abby's replacement.|
|Leon Vance||Rocky Carroll||Director of NCIS.|
|Donald Mallard||David McCallum||NCIS Historian.|
|Westley Clark||Scott William Winters||CIA Officer.|
|Mallory Madden||Dionne Gipson||CIA Officer, assigned to date Vance.|
|Sam Hendrix||Adam J. Harrington||Coast Guard Commander.|
|Jordan Peralta||Aaron O'Connell|
|Nena Easterling||Tania Nolan||Civilian Employee and Commander Hendrix's assistant.|