When Callen goes rogue and embarks on a secret mission that leaves Sam and the team in the dark, Hetty demands that his operation be shut down and tasks the team with finding him.
DEA agent Talia Del Campo seeks help from NCIS after her partner is murdered. Meanwhile, Kensi grows suspicious that Deeks is hiding something, but he surprises her by introducing her to his mother.
The NCIS Los Angeles team investigates a 20-year old Peruvian massacre after a well-known fashion model, believed to be one of the survivors, is now a potential target. Also, Kensi goes undercover as the model's assistant and Deeks as her chauffeur.
Callen and Sam are forced to work on their day off when they mysteriously receive a cell phone and the caller threatens the lives of innocent people if they don't do exactly what he says.
NCIS Special Agent DiNozzo partners with the NCIS: Los Angeles team to search the city after his prisoner escapes custody on a flight from Singapore to Los Angeles.
The team searches for Sam's former partner, Ruiz, who disappears while buying a deadly explosive during an undercover operation
Kensi and Deeks go undercover as cult members to rescue a former Department of Defense employee brainwashed into revealing classified information, as the rest of the team works to prevent the cult from selling the government secrets.
The team searches for Jada, the woman Sam led to asylum in the United States four years ago, after she goes missing. Also, Kensi goes undercover with DEA Agent Talia Del Campo.
The team searches for a missing teenage girl who is feared to have been recruited by a terrorist organization.
While Deeks is under arrest and interrogated for the murder of his former partner, the team races to try and prove his innocence
When a suspected North Korean spy is poisoned and hit by a truck carrying Christmas trees, the team must search for who is responsible for smuggling spies into the country. Also, Deeks and Kensi try to find a way to include their mothers in their Christmas plans, and Hetty notices that Granger isn't feeling the holiday cheer.
Kensi and Deeks go undercover at a decommissioned nuclear power plant as the team investigates the radiation poisoning of a Gunnery Sergeant moonlighting as a security guard there.
The team investigates the murder of tech entrepreneur turned venture capitalist who secretly developed a daemon, a background computer program that allows for undetectable data collection
When Kensi and Deeks announce to the team they are moving in together, coincidentally, Hetty assigns them to protection detail for Jack, Kensi's ex-fiancé, who is in possession of a list containing important contacts in Afghanistan that people are willing to kill to get their hands on.
In order to locate Arkady in Russia, the NCIS team goes undercover with his daughter, Anna, at a gala in Los Angeles to gain access to the Russian Consul General's computer.
While they're in Russia, Callen, Sam and Anna craft a plan to break Anna's father and his CIA agent companion out of prison. Also, Special Agent G. Callen finally learns what the "G" in his name stands for, and in Los Angeles, Kensi and Deeks take Eric into the field on an assignment.
After extensive surveillance footage of Sam's family is found in Africa, Sam and Callen fly there to determine who is responsible and for what purpose. Also, Sam's family is moved from their home to a safe house.
When a convicted Cuban spy escapes U.S. custody just before he is set to return to his country in a prisoner exchange, the team is shocked to learn that Anna helped him break out. Also, Deeks admits to Kensi that he thinks she is too messy.
Callen and the team try to save a child in imminent danger who has been brainwashed by a terrorist cell. Also, Deeks and Kensi discuss having children.
While assigned to protective details for the commander of the Pacific Command, the team searches for a North Korean spy.
The team learns that operational psychologist Nate Getz is working with an infamous crime leader, after he fails to check in with Hetty while working undercover on a mission linking organized crime to terrorism.
Granger escorts Jennifer Kim, a North Korean spy who is his long-lost daughter, back to Los Angeles and interrogates her.
Sam and Callen go undercover as firefighters when top secret information about suspected terrorists is stolen from a secure Department of Defense container at the site of a fire.
When Sam's Son's school is taken over by an extremist group, the team rushes to San Francisco to protect him and free the hostages.