The NCIS: LA team takes action to protect one of their own while being interrogated by the Department of Justice. Meanwhile, Nell goes undercover as Hetty, and Director Leon Vance gives Hetty disturbing news while she is in Washington. (TV-14 L, V)
The NCIS: LA team discovers that one of their own is compromised when they investigate the murder of a Navy contractor involved in illegal transactions of confidential data. Meanwhile, Hetty is under investigation in Washington, D.C., when the Department of Justice arrives in L.A. to investigate the team. (TV-14 L, V)
Callen and Sam are trapped in an armed submarine that terrorists have aimed to hit an aircraft carrier in San Diego. Meanwhile, Hetty defies orders and forgoes her trip to Washington, as the team tries to locate and save Callen and Sam and prevent the terrorist attack. (TV-14 L, V)
When the NCIS: LA team and the DEA uncover the cartel's plans to slyly transport billions of dollars' worth of cocaine from Colombia to the United States using a submarine, Callen and Sam must quickly locate the missing vessel. Meanwhile, Hetty is called to Washington in the aftermath of the controversial mission in Afghanistan.
When a news reporter announces the group responsible for the deadly explosion at a military sponsored charity event, the team must investigate her claims and search for the attacker. Tiffany Dupont and Tony Okungbowa guest star.
Sam is convinced that the theft of software for a new unmanned aerial vehicle is connected with the disappearance of the lead engineer's 10 year old daughter, a girl Sam once provided protection detail for in Saudi Arabia.
When an undercover NCIS agent is suspected of working for the smuggler he's supposed to be investigating, the team takes him into custody to find his true intentions. Meanwhile, Kensi and Deeks discuss their personal relationship as Kensi returns to the field. Daniel Henney guest stars.
When the NCIS: Los Angeles team investigates a case involving a former marine who is being tracked down by members of al Qaeda for embezzling money from Iraq, Hetty assigns Nell to join Deeks in the field. Meanwhile, Eric is given a new partner in Ops.
After learning that Special Agent Kensi Blye disappeared and the Taliban may be he holding her captive, Hetty sends the NCIS: LA team to Afghanistan on a rescue mission.
The NCIS: LA team is called in to determine if the computer system that controls Russian missiles is at risk after Eric overhears his friend, a computer systems expert, being attacked during online game play. Meanwhile, Kensi is shocked when a familiar face from her past shows up in Afghanistan.
When an undercover agent is identified and executed by a local gang, the NCIS: Los Angeles team must locate the mole before other agents' lives are put in danger. Meanwhile, Granger begins to worry when Kensi disappears in Afghanistan.
Following an explosion at a fish market, the NCIS: LA team partners with an undercover DEA agent to determine if the incident is an act of terrorism or a botched drug smuggling deal. Meanwhile, in Afghanistan, Granger and Kensi investigate a helicopter crash that could be tied to their ongoing search for the infamous white ghost.
Sam and Callen head to Mexico to search for Tuhon, a retired assassin they encountered on their very first case together, now a suspect in the murder of a diplomat. Meanwhile, Nate and Deeks stay in Los Angeles to assist with the investigation. Peter Cambor and Danny Trejo guest star.
When two private military contractors are murdered, the teams' investigation leads to a suspect who puts one of their own in serious danger. Meanwhile, Sam sets up Callen on a blind date.
While in Afghanistan, Kensi and Granger join the team on a joint case when a federal agent in Los Angeles tied to Hawala, an ancient system of money transfer, is murdered.
The NCIS: Los Angeles team searches for a motive when a senator's daughter is attacked. Meanwhile, Deeks and Nell partner up to help Sam and Callen bring the daughter to safety and Kensi receives the perfect holiday gift from one of her co-workers. Michelle Trachtenberg Guest Stars as Lily Lockhart.
Hetty leaves her Congressional hearing after receiving news that Mattias has returned.
Nate talks to Nell about the shooting.
Mattias Draeger returns to Los Angeles.
The team gets to Hetty in the nick of time.
Hetty calls Nell for a Sit Rep. Also, G. and Sam head to Salazar's house after he sends the team a video of Mattias.
The NCIS: LA team runs into trouble while attempting to track down Mattias.
NCIS: LOS ANGELES is a drama about the high-stakes world of an NCIS division charged with apprehending dangerous and elusive criminals that pose a threat to the nation's security. By assuming false identities and utilizing the most advanced technology, this team of highly trained agents goes deep undercover, putting their lives on the line in the field to bring down their targets. Special Agent "G" Callen is a chameleon who transforms himself into whoever he needs to be to infiltrate the criminal underworld. His partner is Special Agent Sam Hanna, a former U.S. Navy SEAL who has seen action in both Afghanistan and Iraq. Assisting the team is Special Agent Kensi Blye, the exceptionally bright daughter of a slain Marine who lives for the adrenaline rush that comes with undercover work; Operational Psychologist Nate Getz, who is adept at getting into anybody's head, profiling the target and monitoring agents' states of mind before, during and after missions; Tech Operator Eric Beale who has mastered every gadget and computer in the Ops Center; and Henrietta "Hetty" Lange who oversees the "backroom" support staff tasked with providing everything from micro-surveillance cameras to cars. New to the team this year is LAPD Liaison Marty Deeks, a seasoned LAPD undercover detective who was recruited to the team by Hetty. Armed with the latest in high-tech gear and sent regularly into life-threatening situations, this tight-knit unit relies on each other to do what is necessary to protect national interests.
The team discover that one of their own is compromised when they investigate the murder of a Navy contractor who was involved in illegal transactions involving confidential data. Meanwhile, Hetty is placed under investigation in Washington, D.C., and representatives from the Department of Justice arrive in Los Angeles to investigate the team.
Marty and Kensi take out their frustrations on each other in the ring.
Henrietta appears to be in trouble and G. Callen is ready to fly to her rescue, but Sam and the others think they should wait until they have more information.
Season 6 begins with Callen and Sam becoming trapped in an armed submarine that terrorists aim at an aircraft carrier in San Diego. Meanwhile, Hetty defies orders and forgoes a trip to Washington, D.C., to help locate Callen and Sam, and prevent the attack from being carried out.
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