When one of their own disappears while undercover, the team must work alongside LAPD on a case involving human-trafficking, money laundering and drugs.
After a mysterious hit squad takes out a Special Agent on assignment, the NCIS team jumps into action before the next target is set.
The NCIS team jumps into action when video surveillance footage shows an ambush on a humvee transporting Marines in the desert. Meanwhile, Nate returns from his mystery assignment.
The NCIS team investigates the murder of a Marine with top-level security clearance after he is found dead and missing a hand in a Beverly Hills parking lot off Rodeo Drive.
Videotape revealing a Naval Commander's daughter being buried alive strikes a nerve with Special Agent Sam Hanna and thrusts the NCIS team in a race against the clock to save the girl before time runs out.
After a downtown Navy Recruitment Center is held hostage, Callen mediates with his ex-partner, Tracy Keller, to uncover information about a hijacked shipment of Spike missiles.
After a state department employee and a plastic surgeon are murdered by a group of terrorists, the NCIS team must frantically search for the only witness who can identify the killers' surgically altered faces.
When a former Army Sergeant responsible for hunting down high-value targets is found dead, the NCIS team searches for terrorist leaders suspected of his murder. Meanwhile, Deeks bonds with a person of interest in the case, making him more determined than ever to track down the killers.
Murdered antiques dealer has Hetty and the NCIS team searching for his missing book containing top-secret information in part one of a two-part episode.
Hetty and the NCIS team continue to search for an elusive book that has the attention of several foreign security agencies, in the conclusion of a two-part episode.
Kensi connects personally with a discharged Navy Intelligence officer suffering from post traumatic stress disorder who is the sole survivor of a deadly dispute being investigated by the NCIS team.
The NCIS team uncovers an experimental Navy tracking system when a body containing a top-secret residue is stolen from an autopsy room. Meanwhile, Callen challenges Hetty on the rock wall.
The NCIS team sets out to find the individual responsible for stealing a classified Pentagon document before the file's decryption code is cracked by the wrong party.
Sam goes undercover as a prisoner to track down a terrorist group responsible for several bombings around the world.
After Callen catches a man breaking into his house, a former KGB operative leads the NCIS team to a shipment of counterfeit computer chips entering the United States.
Suspicious of an undercover venture involving a deal between corrupt cops and military personnel, Callen and Sam try to expose the illegal operation by posing as California highway patrol officers.
Deeks' morning routine is disrupted when he is shot during a convenience store robbery, leaving the NCIS team to investigate whether he was the assailants' intended target.
Sam resumes a former alias and boards a one-way flight to Yemen in hopes of tracking down a terrorist group's leader and rescuing the hostage son of a Saudi Prince.
Investigates whether the life of a Venezuelan politician is in danger after a Navy Intelligence Commander who is responsible for tracking his moves suddenly disappears.
Kensi goes undercover as a thief in the hopes of uncovering the object that a world-class thief intended to steal.
After a rocket engine expert is killed, NCIS tech operator Eric Beale goes undercover for the first time to ensure that the classified technology used to build satellites is safe.
Deeks resumes an old alias he is not fond of in order to protect his best friend and chief informant from a criminal group that wants him dead.
After a Navy SEAL imposter is set ablaze, NCIS obtains new information regarding the whereabouts of the stolen Brachytherapy canister from a previous case that could be used to make a deadly bomb.
Hetty's sudden resignation prompts Callen and the NCIS team to investigate the reason why she would disappear in the hopes of tracking her down.