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An international killer who can take on the façade of any personality he needs has been able to evade law enforcement across the world, even Callen. With Assistant Director Granger breathing down their necks, the NCIS team must track this killer down.
Season 6 ends with the team traveling to Moscow where they assume multiple undercover identities to locate suspects in an ongoing case. Meanwhile, Callen uncovers new information regarding his father.
The team runs into problems while attempting to clear Kensi Blye from charges of murder after she has a deadly confrontation with CIA agents.
The arrest of Kensi for the murder of her father's former associate leaves the NCIS team astounded and scrambling to prove her innocence.
The holidays lead to distractions for the team as Sam tries to get the perfect gift for his daughter and Eric is all set to meet Nell's parents. Only the team is assigned to find a stolen device that could cause destruction throughout the city.
With national security threatened, the team must determine what went missing when a diplomatic service van was hijacked. After five years as partners, Callen and Sam are about to confront their biggest challenge.
An international conference at the Vietnamese Consulate could be threatened when a shooting takes place nearby. The team is assigned to assess whether or not the shooting is a terrorist attack before the Secretary of Navy arrives.
NCIS needs to find who's responsible for ambushing the vehicle transporting Jada Khaled so their case can be salvaged. This means Sam will have to face up to Jada for the first time since bringing her back from Sudan.
Kensi faces her feelings when Deeks is fired from NCIS and sent back to the LAPD.
When a retired CIA agent is murdered, the team must question Hetty regarding her relationship with the man.
Sam fears for his family's safety when his wife is called to resume a former CIA cover after a case suggests ties to the infamous Sidorov and his stolen nukes. Aunjanue Ellis guest stars.
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.
The missing body of a cartel boss sends Kensi and Deeks to Mexico while the rest of the NCIS team looks for a potential leak within the DEA's special task force.
As their investigation continues, evidence turns up that links the death to a group of Russian agents. Sam's deepest secret is at risk of coming out.
To help the team find a murderer, Nell puts her smarts to work when she goes undercover to replace a murdered DOD researcher. The new NCIS Assistant Director questions Hetty's leadership abilities.
A smuggling case takes the NCIS team to Mexico to investigate and find missing hazardous materials.
Kensi and Deeks go house sitting in the suburbs to flush out a Russian sleeper cell.
Before a group of Navy SEALs can embark on a hostage rescue mission, Sam Hanna is forced to interrogate the group to determine who killed a Navy intelligence officer.
After a Navy lieutenant and pilot are poisoned by cyanide laced water, the NCIS team investigates to see if the two were targeted or if it was a trial run for a large-scale contamination.
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
As the NCIS team looks into a missing person's case, they discover that the woman is an undercover agent from Hetty's past.
Callen has been placed on suspension and with Hetty's retirement, the team is having difficulty adjusting to their new roles.
When a crime is posted on the internet, the NCIS team heads to the beach to investigate any links a surfer and a dead Naval tech scientist might have to the video.
The NCIS team investigates an international car shipping ring when a woman from Deek's past is found to be involved. Kensi goes undercover at an auto body shop as part of the investigation.
To return a favor, Sam goes all out to help an Afghani elder, who helped him when he was wounded, look for his missing nephew.
As the team continues their search for Hetty in Romania, Callen finds answers to the secrets of his past.
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.
While the NCIS team is investigating a kidnapping, Callen confronts the man who may be his father.
When a Marine that was dishonorably discharged is accused of murder and claims he was framed, it is up to NCIS to figure out the truth.
The team is spread out for the holidays with Callen, Sam, Kensi and Deeks at sea looking into the death of an NCIS agent. While Hetty decides to take a trip, Eric and Nell keep thingsgoing back at headquarters.
The team investigates the only survivor of a former terrorist group. Kensi and Deeks follow a trail that leads them to the woods.
A joint operation between NCIS and LAPD is necessary when a known terrorist is linked to a local drug cartel. Sam is distracted when an important item comes up missing.
After receiving a cryptic voice mail from a former CIA colleague, Sam Hanna is taken to a warehouse where he encounters a dead body, a large white poodle, layers of paper work and books, and a mystery that takes the OPS team down a rabbit hole of dog shows and covert spies.moreless
The team goes undercover in order to investigate a crime connected to a cartel suspected for terrorist interactions.
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.
When four people are killed in an explosion at a diner, NCIS is brought into to investigate as they were linked to a classified project. Kensi finds herself sympathizing with a teenager that is related to the investigation.
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.
When Deeks' best friend and major informant needs protection from death threats, Deeks must go undercover as one of his old aliases.
A joint CIA-NCIS operation gone wrong leaves an undercover Sam missing in Sudan, forcing Callen and the rest of the team to look for him before all is lost.
Looking for information on a notorious arms dealer, Deeks goes undercover and makes friends with a female source. While keeping surveillance on Deeks and the woman, Kensi is challenged by new emotions.
Hetty orders a lockdown and Eric becomes one of seven suspects after Granger is poisoned by the mole.
Callen goes undercover in order to penetrate a Chechen terrorist group that recruits foreigners and plans their next attack in the United States.
The NCIS team becomes involved in the Libyan conflict when a news reporter is murdered. Callen learns something about his past from Hetty and it could affect their relationship.
When a murder weapon in Idaho matches a case in Los Angeles, Callen and Sam head to Idaho to join NCIS: Red, a mobile team who travel to various locations to solve crimes.
The NCIS team looks into a gold heist that may be linked to terrorism. Kensi is forced to partner with Granger while Deeks testifies in court.
The joint NCIS: Los Angeles and Hawaii Five-0 task force head back to the mainland as they follow the suspect who's threatening to release a deadly virus.
The death of a naval officer sends Kensi and Deeks uncover at a rehabilitation facility.
Following a drone strike in Afghanistan and the finding of a retired marine's body in the ruins of the bomb-making compound, the team investigates the man's loyalties and connections to the Taliban.
It's an issue of national security as the NCIS team investigates whether the death of a U.S. senatorial candidate's staffer was an accident or a murder.
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.
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.
A teenager's hacking skills get the attention of NCIS after he compromises terrorist missions.
As Kensi and Deeks sort out their relationship, Callen and Sam call on a Nepalese Gurkha to help recover a missing flash drive.
The NCIS team in Los Angeles continues to work with the mobile Red team to find the terrorist before he disappears.
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.moreless
A woman with knowledge of a long forgotten Middle Eastern fortune marked for war could hold the key to Callen's past.
After a former Navy intelligence officer is murdered, Hetty contacts a former coworker when the NCIS team uncovers a threat to national security.
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.
The team must locate the stolen nuclear weapons as Deeks and Sam must physically and emotionally recover from their ordeal.
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.
After the U.S. consulate in Tunisia is attacked, Callen and Sam go on a secret and perilous mission to retrieve key evidence from the crime scene. When they return, they seek help from the U.S. Ambassador, who narrowly escaped the attack, to provide missing information.
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.
As the search for stolen nuclear weapons is revived, Hetty sends Callen and Kensi overseas while Deeks helps stateside as Sam and Michelle go undercover.
Callen and Sam search for Arkady when crew members from the missing oil tanker used in his deal with Russia are found dead in the ocean. Their investigation also uncovers Arkady's personal connection to the ship.
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.
Callen is taken hostage when terrorists take control of a building where he is working undercover to investigate an arms dealer. When the NCIS team arrive, they discover the entire building is wired with explosives.
When a serial killer strikes in Los Angeles, it grabs the attention of Abby Sciuto. She travels from Washington DC to give the team a hand, since she has been following this killer for some time.
A car explosion sends the team on a mission throughout the city to find the other stolen explosives before they can be detonated. Amidst great protest, Hunter rearranges the team partnerships.
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.
The team investigate when three FBI agents are killed in an explosion following a successful undercover sting operation. Meanwhile, Deeks and Kensi realize Hetty knows about their relationship when she pairs Kensi with Sam, and Deeks with Callen during the probe.
Callen and Sam are shocked when an old acquaintance they thought had been murdered shows up and asks for their help. Their investigation uncovers a possible breach of America's economic sanctions against Russia.
Motivated by revenge, the Chameleon once again challenges the NCIS team after an undercover assignment sets in motion a deadly mind game devised by the criminal mastermind.
Still grappling with his emotions, Deeks returns to field work while NCIS investigates a biotech death related to a classified vaccine.
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.
Sam is shot while trying to apprehend a spy contracted by the CIA. The team enlist the help of Thapa, the elite Nepali soldier from their past, to help locate the shooter. Meanwhile, Kensi and Deeks have their first official argument.
A burglary occurs at a cyber-security company, but Callen is forced to steer clear of the investigation when Hetty tells him that his girlfriend, Joelle, is one of the lead witnesses. Meanwhile, the team discuss their personal holiday travel plans.
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.
Callen and Sam are kidnapped when they follow an anonymous tip about a missing NSA agent. When the team discover they are missing, they realize it may have been a trap set by terrorists.
Hetty decides to send the NCIS team to Afghanistan after she learns Kensi is missing and the Taliban may have her.
NCIS must determine if a Venezuelan politician is in imminent danger of being assassinated. It all hinges on a Navy Intelligence Commander who has gone missing.
Callen and Sam work undercover as a prisoner and guard to infiltrate a white supremacy group believed to be in possession of stolen nuclear material. Kensi transforms herself into a tattooed biker chick to play Callen's girlfriend. Meanwhile, Callen's first meeting with Hetty is revealed.
The team investigate when a missile test is hijacked and the missile is sent off course. Hetty brings in a young computer specialist to assist in the probe, but Nell becomes jealous when the tech guru and Eric start to bond.
The NCIS team must find two missing Afghanistan soldiers who are training in the U.S. so they can't disclose classified military operations to their captors. The team worries that Sam is back to work too soon and Callen figures out that he and Sam have very little in common.
Callen and Sam travel to Mexico to track down the only employee who escaped a professional hit at the Department of Defense. Back in the States, the rest of the NCIS team work to uncover the motive behind the shooting.
Hetty receives some shocking news from NCIS director Leon Vance while she is investigated by the Department of Justice in Washington, D.C. Meanwhile, Nell goes undercover as Hetty to protect a fellow team member.
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.
Continuing from last season's finale, Season 6 opens with Callen and Sam trapped in a terrorist's armed submarine headed for an aircraft carrier in San Diego. Hetty ignores her orders to report to Washington as the team tries to locate and stop the armed submarine.
Callen and Sam work undercover as food truck owners in Mexico to find the source of an anthrax poisoning and prevent a bioterrorism attack.
Sam reflects on his relationship with his father when the team investigate the murders of marines who have sons in military academies.
Sam is arrested for murdering a woman, but Callen and Granger work to clear his name. Meanwhile, Kensi and Deeks discover a link between the victim and a student from Sam's past.
A man is murdered by a small drone, and the investigation reveals he was connected to a terrorist group that is planning an attack on Long Beach. With time running out, Nell uses her drone expertise to try to prevent a disaster.
A Marine's death raises suspicions from his wife about his last battle. Sam and Callen try to find out whether there has been a cover up. When Hetty invites Operational Psychologist Nate Getz, the team suspects an evaluation is coming up.
The team search for an expert marine sniper who escaped from a veterans hospital when it's discovered he's connected to the leader of an extremist group. Meanwhile, the case reminds Kensi of her past as a sniper.
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.
After a cyber attack on the DOD, NCIS and the NSA team up to locate the person responsible. Callen continues to look for information regarding his past.
When a former Marine turned homeless is murdered, Kensi and Deeks go undercover for the investigation and find a link to the Mexican cartel.
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 team members desperately search the city when they learn that someone from their past is targeting one of their own. Meanwhile, operational psychologist Nate Getz visits Nell to help her through a traumatic experience.
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.
Nate Getz asks the NCIS team for help when the FBI looks at an ex-Marine alleged to have made a chemical bomb.
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 father.
When a Petty Officer in the linguistic unit is murdered at a strip club, the team is assigned to find out if this is a coincidence or a breach. The investigation finds a connection to Sam and his past. Hetty takes a closer look at the team and how they are handling the pressures of the job.moreless
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.