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When a CIA agent who worked with Sam Hanna over eight years ago seeks his help and is soon found dead of an apparent suicide, Hanna and Callen suspect foul play and a bigger conspiracy.
The NCIS: LA team investigates the tragic death of a U.S. senatorial candidate's staffer who is run over crossing the street.
The NCIS: LA team investigate a compromised intel operation after four people connected to the classified project are killed at a diner explosion.
A drone strike on a bomb-making compound in Afghanistan reveals the body of a recently retired Marine, leaving the NCIS: LA team to investigate why the Marine returned to Afghanistan.
Following Callen's public shooting of the Chameleon, he is placed on suspension while Hetty adjusts to retired life on the Season 4 finale.
Deeks and Kensi go undercover as a married couple as they try to find a Russian sleeper cell on NCIS: Los Angeles.
The joint NCIS: Los Angeles and Hawaii Five-0 task force travel from Hawaii to Los Angeles, when the lead suspect in the case moves to the mainland with a deadly virus in tow.
The NCIS team must work the the FBI to track down a Marine believed to have created a chemical bomb.
When the body of a Navy Intel Officer is found, evidence points to a team of Navy SEALs who are about to depart on a hostage rescue mission.
NCIS: LA investigates a shooting outside the Vietnamese Consulate just prior to an international conference at the venue that the SecNav is scheduled to attend.