A Marine is murdered in Washington and the NCIS team investigating finds evidence that links the man to Los Angeles. The NCIS Office of Special Projects is assigned to the case involving the dead Marine and Agent Gibbs and McGee travel form Washington to assist them in solving this murder of a marine.moreless
Callen, who has been recovering from severe injuries, returns to the NCIS Office of Special Projects and immediately joins his team-mates in solving a kidnapping case which might have national security implications.
During a Marine Corps training exercise a predator with hellfire missiles is hijacked, resulting in the death a Marine. The team must locate this UAV before it can be used against America.
The team is assigned to find a former Marine, Walton Flynn after an Iraqi businessman is murdered. Flynn was assigned by a private firm to protect this man and it is reported that he killed the man.
When a man is found dead, the team is assigned to find if anyone else has the classified information he was working on. They discover that a well-known assassin, who has a history with Director Vance, murdered him.
When a Marine falls from a rooftop club, the NCIS team is called in to investigate his death. They discover that he has been living a double life and they look for a motive to his murder.
The team investigates the murder of a Marine, while Hetty is away at Senate hearings. This investigation leads them to a militia group and stolen missiles.
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.
The team must put their holiday decorations on hold to investigate a Marine's death by his cell phone blowing up. They begin to realize that they need to locate his former unit to protect them from further explosions.
When a Petty Officer in the linguistic unit in 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
Callen wants to take on a mission by himself when a parolee he put in jail is murdered. The team tries to keep track of him from a distance, as he resurrects one of his old aliases.
As a scheduled staff training session is interrupted by an "Agent needs assistance" page, the team begins assessing the situation and looking for their missing agent.
When a group of men are killed, wearing Marine uniforms, in a laboratory, the team is assigned to investigate to determine what they were making and how they got the uniforms.
When a lieutenant commander's death appears to be a suicide, the team is ordered to investigate to determine if the top-secret project he was working on has been compromised. Nate is assigned to partner with Kensi during this operation.
The team investigates the death of a sailor involved in illegal street racing. The situation becomes more concerning when they realize that he had classified Navy equipment with him.
The team investigates the murder of a Navy officer in conjunction with the LAPD per Hetty’s request. The investigation leads them into the world of Hollywood’s elite.