Sam insists Callen find a new partner while a threat of a North Korean attack looms.

The NCIS team partners with a member of the Secret Service to stop importation of very high quality counterfeit currency from Peru.

The team is assigned to investigate the murder of a U.S. Navy lieutenant.

Sam expresses his trust in an old acquaintance, but is it justified, with a LOT of guns around, and, of course, some deaths? Meanwhile A.D. Mosley shows what she is worth.

Sam goes undercover as a day trader after an investment banker who has ties to Russia is murdered.

LAPD Detective Whiting (Karina Logue) calls in a favor from Deeks after his former partner, LAPD Lieutenant Bates (Patrick St. Esprit), goes rogue and only Deeks can bring him in.

Kensi is transported to a missile launch facility to help thwart a takeover of nuclear weapons.

The team must find assailants who illegally crossed the border and attacked Border Patrol officers and illegal aliens; Homeland Security sends Nell's older and bossy sister to assist with the case.

Callen and the team question Joelle's backstory after she escapes from a kidnapping and turns to Callen for help.

A Brazilian diplomat is targeted by a skilled mercenary who holds a grudge.

The team investigates a ransom-ware attack that's taken out the whole power grid for Western Los Angeles.

When napalm is discovered at a crime scene, the team investigates the only casualty for possible links to terrorism.

While Hetty is being tortured by her captors in Vietnam, Eric and Nell find a clue to her whereabouts, prompting the team to organize a rescue mission with very little information. Carl Lumbly and John M. Jackson guest star.

The NCIS team joins Hetty's old friends from the Vietnam War in an off-the-books rescue mission to save her from her captors.

Callen and Sam pull Jennifer Kim from witness protection to help the team find an underground spy with an arsenal of bomb materials.

Callen's father is apprehended as part of an exchange for two American photographers being held hostage in Iran.

The team investigates a missing person's case and uncovers a killer who puts on shows for high-paying voyeurs.

Callen and Sam join forces with the ATF when a notorious international weapons dealer returns to the States.

Sam and Hidoko go undercover when a cryptocurrency farm is robbed of over $10 million in Bitcoin codes.

Callen, Sam and Nell head to the Angeles Forest to find pieces of a failed rocket launch, including a top-secret government device.

The team and the FBI team up while investigating a soldier's death.

NCIS investigates the murder of a prison inmate who was the adopted daughter of a notorious counterfeiter. Also, Callen is summoned by the (ATF) Internal Affairs board to discuss Anna's actions during a joint NCIS and ATF case.

During a battle with a cartel, Sam is shot. A suspect reveals information about Spencer Williams.

The NCIS team go all out to rescue a team member and kidnapped child in a daring mission on foreign soil.