The team responds to an "agent-needs-assistance" page and discovers at the crime scene that one of their own is in danger.
A national-security threat is discovered when the bodies of two criminals posing as marines are found at a site where a deadly toxin was made.
Kensi is shot while in a bank during a robbery by three armed criminals who hold hostages.
The team suspects that the death of a naval officer ruled as a suicide could be a murder, and that the crime implies a threat to national security.
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.
A navy recruitment center is taken over by an armed woman, and the team responds, only to find out that the woman is Callen's former partner, Tracy Keller.
A state department employee and a plastic surgeon are killed by terrorists whose faces were surgically altered, and the team tries to find the only witness who can identify their new faces.
A former Army sergeant who was responsible for tracking high-profile targets is kidnapped and murdered, and the case has the team hunting for terrorists.
Part 1 of 2. When an antiques dealer is murdered, Hetty sends the team on a search for a missing book that contains top-secret information.
Conclusion. The teams continues to search for the black book containing top-level secrets.
Kensi takes a case personally when she bonds with a witness, a former naval intelligence officer suffering from post traumatic stress disorder who is the only survivor of a shootout.
The team investigates the theft of a body with a Navy identification marking from an autopsy room, and they uncover an experimental Navy tracking system.
The team looks for a hacker who stole Pentagon documents that were uploaded to a blog before the person gets the decryption code to the wrong people.
Sam goes undercover in prison to stop a group of international terrorists responsible for bombings around the world.
Callen catches a home invader at his house, but the situation leads to a bigger case involving counterfeit computer chips entering the U.S.
Corrupt cops are targeted when it's suspected they're working with military personnel, and Sam and Callen go undercover as California highway patrol officers to stop the operation.
Deeks is shot when a convenience store is robbed and the investigation centers on whether he was the target or an innocent bystander.
Sam and Callen go to Yemen to hunt a terrorist leader and rescue the abducted son of a Saudi prince.
A naval intelligence officer responsible for tracking a Venezuelan politician vanishes, and the agents believe the politician's life could be in danger.
A botched Marine-base theft has Kensi going undercover as a thief to determine what the criminals were trying to steal.
A Navy SEAL imposter's death gives the team a lead on a missing canister used to make deadly bombs.
In the second-season finale, the team searches for Hetty by trying to discover what prompted her resignation and disappearance.
Callen and Sam work undercover as food truck owners in Mexico to find the source of an anthrax poisoning and prevent a bioterrorism attack.
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