Episode 1 : Active Measures
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.
Episode 2 : Citadel
DEA agent Talia Del Campo (Mercedes Mason) turns to the NCIS: Los Angeles team for help after her partner is murdered. Also, after Kensi grows suspicious that Deeks is hiding something, he surprises her by introducing her to his mother (Pamela Reed).
Episode 3 : Driving Miss Diaz
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.
Episode 4 : Command & Control
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.
Episode 5 : Blame it on Rio
NCIS Special Agent DiNozzo (Michael Weatherly) partners with the NCIS: Los Angeles team to search the city after his prisoner escapes custody on a flight from Singapore to Los Angeles.
Episode 6 : Unspoken
The team searches for Sam's former partner, Ruiz (Anthony Ruivivar), who disappears while buying a deadly explosive during an undercover operation.
Episode 7 : An Unlocked Mind
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.
Episode 8 : The Long Goodbye
The team searches for Jada (Ella Thomas), 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 (Mercedes Mason).
Episode 9 : Defectors
The team searches for a missing teenage girl who is feared to have been recruited by a terrorist organization.
Episode 10 : Internal Affairs
While Deeks is under arrest and interrogated for the murder of his former partner, the team races to try and prove his innocence.
Episode 11 : Cancel Christmas
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.
Episode 12 : Core Values
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.
Episode 13 : Angels & Daemons
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.
Episode 14 : Come Back
When Kensi and Deeks announce to the team they are moving in together, coincidentally, Hetty assigns them to protection detail for Jack (Matthew Del Negro), Kensi's ex-fiance, who is in possession of a list containing important contacts in Afghanistan that people are willing to kill to get their hands on.
Episode 15 : Matryoshka
In order to locate Arkady in Russia, the NCIS team goes undercover with his daughter, Anna (Bar Paly), at a gala in Los Angeles to gain access to the Russian Consul General's computer.
Episode 16 : Matryoshka, Part 2
While they're in Russia, Callen, Sam and Anna (Bar Paly) 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.
Episode 17 : Revenge Deferred
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. Ella Thomas guest stars.
Episode 18 : Exchange Rate
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 (Bar Paly) helped him break out. Also, Deeks admits to Kensi that he thinks she is too messy.
Episode 19 : The Seventh Child
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.
Episode 20 : Seoul Man
While assigned to protective details for the commander of the Pacific Command, the team searches for a North Korean spy.
Episode 21 : Head of the Snake
After Operational Psychologist Nate Getz (Peter Cambor) fails to check in with Hetty while working undercover on a mission linking organized crime to terrorism, the team learns he is working with an infamous crime leader.
Episode 22 : Granger, O.
As Granger escorts Jennifer Kim (Malese Jow) back to Los Angeles, he interrogates her regarding a North Korean spy and she admits to knowing he is her father.
Episode 23 : Where There's Smoke...
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.
Episode 24 : Talion
When Sam receives a distress code from his son Aiden (Tye White) that his school has been taken over by an extremist group, Sam, Callen, Kensi and Deeks rush to San Francisco to protect Aiden and free the hostages.