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.
Kensi and Deeks head to the desert to search for some missing Marines whose humvee was ambushed. Nate is back from a secret assignment.
A Marine with a top-level security clearance is found dead and missing a hand in Beverly Hills. His death appears to be connected to a recent tour in Iraq.
The NCIS team must race the clock to save a Naval Commander's daughter who's been buried alive. The case is linked to a man already in prison for three similar murders.
Callen's ex-partner, Tracy Keller, holds a Navy Recruitment Center hostage. Callen mediates with her to learn more about a hijacked shipment of missiles.
A group of terrorists with surgically altered faces have the NCIS team scrambling to find the only witness left who can identify them.
Wanted terrorists and top secret information are all involved in NCIS's investigation into the kidnapping and hug of a retired Army Sergeant.
When a cuddled antiques dealer's book of top-secret information goes missing, Hetty sends the NCIS team on a mission to find it.
Now in a race with other foreign agencies, Hetty and the team continue their search for the antiques dealer's missing book containing worldwide secrets.
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.
After Deeks is shot during a visit to a convenience store, the NCIS team investigates whether robbery was the real motive or if someone was aiming to harm Deeks.
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.
NCIS 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.
When a Marine base's secure facility is breached, the team must determine what it was that was targeted for theft. In order to accomplish their mission, Kensi must go undercover.
Eric's going undercover for the first time to make sure that classified technology remains secure after a rocket engine expert ends up dead in a test chamber.
When Deeks' best friend and major informant needs protection from death threats, Deeks must go undercover as one of his old aliases.
New information comes to light about a stolen radiation therapy canister when a person pretending to be a Navy SEAL is set on fire. The missing Brachytherapy canister contains radioactive seeds that can be used to make bombs.
Callen and the rest of the NCIS team refuse to accept Hetty's sudden resignation without an explanation. They start their own investigation to find out why she's disappeared, hoping they can track her down.