When faulty bulletproof vests are found in a truck full of stolen U.S.M.C. merchandise, the team must determine where they came from and track any defective vests that were shipped overseas.
When a former NCIS agent's body washes ashore in New Orleans, Gibbs reunites with NCIS Special Agent Dwayne Cassius Pride (Scott Bakula) to determine if the murder was politically motivated or related to a well-known case.
Special Agent Pride (Scott Bakula) and Gibbs follow leads after evidence suggests the Privileged Killer has a copycat; DiNozzo receives a special souvenir from Bishop.
When a Navy officer turns up dead on a rural road, the team must figure out if he was killed because he knew too much about an attack on a fellow officer; DiNozzo and McGee start a cleanse.
Former Marine Daniel Harrelson is torn between loyalties to the streets and to his fellow officers when he's assigned to run an elite unit in Los Angeles.
After a domestic bomber dies in an explosion, the SWAT team races to find the man's partner before more devices detonate; Hondo reaches out to his former team leader.
An earthquake hits Los Angeles while the team is engaged in a standoff with human traffickers holding child hostages; Jim Street has trouble adjusting to his new life as a patrol officer.
The Emancipators hold a livestream kangaroo court to publicly execute city politicians; Hondo fights to lift Darryl's spirits; Deacon feels unworthy as he prepares to receive one of the LAPD's highest honors.
Hondo, Deacon, Tan and Cmdr. Hicks engage in a manhunt across Tokyo when an extradited fugitive escapes local custody; the rest of SWAT search for any contacts the criminal cultivated while hiding out in Los Angeles; Street isolates himself.
The team searches for a group of drug smugglers who crash a plane and scatter after a joint mission with the DEA to stop the shipment goes awry; Hondo tries to make amends with Nichelle; Luca experiences anxiety about his return to the field.
The team works together to hunt down a deadly band of mercenaries hired by a wealthy CEO trying to leave the country before he's arrested for running a massive Ponzi scheme; Hondo is forced to confront his changing relationship with Darryl.
In the aftermath of his decision to speak out in the press, Hondo retreats to a quiet town in Mexico to reassess his life and professional future, only to find himself reluctantly drawn into one local family's fight for justice.
In Mexico, Hondo teams up with a local cop for a dangerous rescue mission, only to find himself with a target on his back; in Los Angeles, Hicks considers disbanding the team for good.
When violence erupts at a popular food truck festival, the team must contend with a deadly cartel determined to recover a lost drug shipment at any cost.
A violent cell of extremists looks to extract vengeance by blowing up half of Los Angeles, potentially killing thousands; Hondo questions if he still has what it takes to lead the squad.
The team faces a prison hostage situation, only to be thrown into deeper danger when a bomb explodes, freeing maximum-security prisoners from their cells, including someone with a personal grudge against Hondo.