Gravely injured and unable to communicate with the team in the U.S., Callen, Sam and Kensi, with an unconscious Deeks in tow, search for a safe way home as a cartel boss places a “dead or alive” bounty on their heads. Also, Mosely and retired Navy Admiral Hollace Kilbride beseech their contacts in Mexico and D.C. for assistance with their missing colleagues
After the prototype for a tactical assault suit is stolen from a Navy base and used in a Beverly Hills jewelry heist, the team must determine who stole the suit and what their next target is. Also, retired Navy Admiral Hollace Kilbride temporarily oversees the team while Mosely and Hetty face repercussions for the unsanctioned Mexico mission.
The team supplements the protection of a Saudi prince after a convoy with his decoy is attacked, but things get complicated when the attempted assassin is revealed to be Joelle Taylor.
The NCIS team is in danger after their pictures, as well as Mosley and her son’s names, are included on a cartel hit list. Also, NCIS Deputy Director Louis Ochoa arrives with Special Prosecutor John Rogers to interview Mosley about the off-the-books mission in Mexico.
While assisting NCIS with an undercover operation, informant Elizabeth Williams is arrested and the team is unable to provide her with an alibi. Also, Callen meets with ATF Agent Anna Kolcheck who remains on suspension following her last joint case.
The team gets called in when Mosley becomes a person of interest in the murder of a cartel hitman, and they must track her down before she crosses the line - and without the special prosecutor knowing.
The NCIS team partners with the State Department after the murder of an arms dealer is connected to a series of crimes seemingly executed by someone with elite special forces training. Also, Callen visits ATF Agent Anna Kolcheck in prison as she awaits her sentencing.
Deputy Director Ochoa volunteers the NCIS team to assist with a covert operation tied to a terrorist group advocating for extreme military force. Also, Callen has concerns as to what an assignment of this nature could mean for the future of the team.
While investigating a robbery and shooting at a Navy captain's dinner with a Pakistani general, the team faces a political scandal when the general is discovered to have sensitive information on terrorist camps; Kensi and Deeks look for someone to run their bar.
Following a bank heist resulting in the theft of a Navy contractor's safety deposit box, the team investigates the contractor to see just what was worth stealing - all while dealing with Special Prosecutor Rogers watching over them.
The NCIS team is joined by NCIS Special Agent Nicole DeChamps after a Marine reservist with a history of PTSD disappears following a drunk and disorderly altercation.
The team investigates a possible terror threat after the chief of logistics for a naval weapons station collapses on the job. Deeks and Kensi research different honeymoon locations.
After a witness with information regarding the use of chemical weapons in Syria is hit with a car, the team must work with Turk and the Global Tribunal to find the USB drive containing vital evidence while Kensi stays with the man as he faces death from his wounds.
The team partners with the FBI to locate a terrorist cell in Los Angeles believed to be prepping for an imminent attack.
As the team continues to search for a terrorist cell in Los Angeles, Callen and Sam remain trapped in a movie theater after multiple bombs have detonated and every remaining exit is wired with explosives.
The NCIS team investigates the murder of a journalist who was writing an exposé on a mishandled classified military operation. Also, as their wedding day quickly approaches, Kensi and Deeks work on the last remaining items on their to-do list.
The team prepare to celebrate the long awaited wedding day of Kensi and Deeks, but encounter problems in the unexpected arrival of Anatoli Kirkin. The mysterious contents of the Box is revealed, Hetty returns and Kensi and Deeks finally get married.
Sydney drags Nell along when a high school classmate of theirs is targeted by unknown assassins while the rest of the team believes he is the prime suspect in the murder of a Naval officer guarding a top-secret project.
Deeks, Kensi, Eric, Callen, and Nell have a day off to do their own thing. Deeks and Kensi prepare the bar for a fundraiser while Callen recovers from a gunshot wound and bonds with his sister Alex's son. Eric and Nell make plans to go to San Francisco for Eric's job interview. It is revealed that Nell's mom has heart disease and her entire family is looking to move to San Francisco for a new treatment. Sam teams up with DOJ Agent Hamilton and Fatima to chase down a Texas drug lord who supposedl
After a Navy Seal who worked as a security guard at a marijuana dispensary is attacked, the team's investigation leads them to a potential mass shooting.
Anna and her cellmate escape from prison, leading OSP to assist in locating them to avoid a potential bloodbath.
The NCIS team travels to Cuba for an unsanctioned mission after Callen gets a lead on Anna Kolcheck's whereabouts.
Callen and Sam travel to the USS Allegiance in the Persian Gulf to work with Navy Captain Harmon Rabb, Jr. (David James Elliott) when the team uncovers a terror threat on military locations.
Callen, Hanna, and Rabb detain several terror suspects onboard the Allegiance but are simultaneously forced to deal with Iranian forces amassing on the Iraqi border; Lt. Colonel Sarah MacKenzie (Catherine Bell) helps the rest of the team untangle a complicated spy web involving a crooked Russian diplomat, Chechen terrorists, and an increasingly meddlesome ISIS; Eric is conflicted between being there for Nell and her mother in the hospital and scrambling to neutralize the terror threat and preven