Callen and Sam work with Navy Capt. Harmon Rabb Jr. to apprehend spies aboard the USS Allegiance; Hetty tries to neutralize a missile attack in the Middle East; Kensi and Deeks are trapped in a mobile CIA unit in Iraq while under attack.

Faced with multiple cases worldwide, the team splits up, with Callen and Sam working in Tel Aviv while Kensi partners with Department of Justice Agent Lance Hamilton in Los Angeles.

Callen and Sam run protection detail for retired Navy Adm. Kilbride in an operation to locate a missing naval intelligence officer.

The murder of a Naval lieutenant leads the team investigating a potential ebola outbreak - Callen and Sam check her ship, the USS Allegiance while Kensi and Deeks follow her movements after leaving the ships.

The NCIS team searches for a stolen painting valued at $40 million after online chatter indicates the artwork is being sold on the black market to fund terrorist activity.

The NCIS team reluctantly aligns with two former criminals from England, Ricky Dorsey and Frankie Bolton, after a powerful arms dealer kidnaps Ricky's daughter in an attempt to obtain a dangerous weapons system.

The NCIS team links the theft of an undersea drone prototype to a video game streamer's elaborate party.

After a Navy lieutenant disappears from the scene of a car accident, the NCIS team processes the crime scene and discovers his laptop is missing along with recently accessed confidential information for retired Navy SEALs.

Callen and Sam travel to San Francisco to search for Beale after he's kidnapped during a clandestine mission for Hetty.

Akhos Laos, a former black ops agent originally recruited and trained by Hetty Lange, returns to seek revenge on Hetty for the life she introduced him to.

CIA Officer Veronica Stephens (Dina Meyer) asks the NCIS team for help when an agricultural engineer Hetty asked her to bring to the United States disappears.

After a rise in deaths caused by black market opioid use, the NCIS team links the street drug to funding for terrorist activities.

"Commitment Issues" - The NCIS team investigates the murder of a Naval warfare engineer at a spoken poetry event. Also, Callen asks Nell to assist him in a worldwide search for Anna's whereabouts.

Anna Kolcheck returns to warn Callen that he is in danger and he must now work with an archenemy to stop an underground trafficking ring.

When Fatima is captured while on a mission and held for ransom, Callen and Sam enlist a deep undercover CIA agent to help get her back.

When an FBI agent is killed while trying to track the location on an undercover agent, NCIS must find the missing agent before the criminals find him.

While NCIS investigates the disappearance of a department of defense officer who was looking into a recent UFO sighting, Anna (guest star Bar Paly) makes a bold decision about her future.

The team assists the DOJ in the investigation of an arsonist who targets an FBI agent house that's protecting a political activist seeking asylum; Eric deals with the aftermath of Nell leaving the team.

The team helps a former NCIS tech operator search for her missing ex-partner, whom they fear might be working with the gun runners they failed to take down years ago; Deeks reels when his bar gets a negative review.

Sam, Callen and Rountree travel to Afghanistan to help with a sensitive case after two SEALs claim their chief murdered an unarmed prisoner.