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Season 5 ends with the team learning that a cartel plans to transport billions of dollars worth of cocaine from Colombia to the U.S. using a submarine. Callen and Sam are assigned the task of locating the missing vessel. Meanwhile, Hetty is called to Washington in response to the mission in Afghanistan.moreless
A deadly explosion at a military-sponsored charity event is investigated, as is a news reporter's claim of who is responsible.
A 10-year-old girl Sam once provided protection detail for in Saudi Arabia goes missing, and he's convinced her disappearance is directly connected to the theft of software for a new unmanned-aerial vehicle being developed by her engineer mother.
An undercover NCIS agent is taken into custody when he is suspected of working for the smuggler he is supposed to be investigating. Meanwhile, Kensi and Deeks discuss their relationship when Kensi returns to the field.
When Nell joins Deeks in the field to investigate a former marine being tracked by Al Qadea for embezzling Iraqi money, Eric is assigned a new Ops partner.
Hetty decides to send the NCIS team to Afghanistan after she learns Kensi is missing and the Taliban may have her.
While online during game play, Eric overhears his computer systems expert friend being attacked. Now it's up to NCIS to figure out if the computer system that manages the Russian missiles is at risk. A familiar face from Kensi's past shows up in Afghanistan.
When a local gang records the execution of an ATF agent, the team is tasked with determining how his cover was blown. Kensi goes missing in Afghanistan which makes Granger worry about her safety.
The NCIS team needs to determine if an explosion at a fish market is terrorism or a failed drug smuggling deal. Granger and Kensi continue their search for the notorious white ghost with an investigation into a helicopter crash.
Callen and Sam's new murder suspect is a retired assassin they came across on their first case together. As the two head to Mexico to find him, Deeks and Nate help out the investigation in Los Angeles.
A suspect in NCIS' murder investigation of two former military contractors puts one of the team in serious peril. Callen gets set up on a blind date.
Kensi and Granger reunite with the rest of the Los Angeles NCIS team when the murder of a federal agent in Los Angeles might be tied to a possible terrorist attack.
NCIS delves into the reasons behind an attack on a senator's daughter. Deeks partners up with Nell to back up Sam and Callen in their effort provide security for the daughter. One of Kensi's co-workers gives her the ideal holiday gift.
The NCIS team turn their attention to an alleged war criminal, a former Communist lead from Romania, when it's discovered he living in Los Angeles under an assumed name.
As Kensi and Deeks sort out their relationship, Callen and Sam call on a Nepalese Gurkha to help recover a missing flash drive.
The death of a naval officer sends Kensi and Deeks uncover at a rehabilitation facility.
With a nuclear terrorism attack looming, the team must find the stolen nuclear detection device. As the case proceeds, Hetty realizes someone from her past is back and could jeopardize her career.
The murder of a train yard security guard sends the team and Homeland Security after a mastermind who may be plotting a terrorist attack on a train.
A teenager's hacking skills get the attention of NCIS after he compromises terrorist missions.
When a former Navy officer's girlfriend is kidnapped, Nell joins the team in the field after the ransom demand is for intelligence information. Deeks has no idea he's violated one of Hetty's rules.
While the NCIS team is investigating a kidnapping, Callen confronts the man who may be his father.
Still grappling with his emotions, Deeks returns to field work while NCIS investigates a biotech death related to a classified vaccine.
Psychologist Nat Getz returns to help Sam and Deeks overcome their recent trauma and return to work. The murders of a former Navy Admiral and journalist on a plane are the focus of the rest of the team.
The team must locate the stolen nuclear weapons as Deeks and Sam must physically and emotionally recover from their ordeal.