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A nuclear explosion reignites the search for stolen weapons; Hetty shuffles partnerships, so Callen and Kensi go overseas, while Deeks and Sam investigate stateside.

NCIS: Los Angeles

Descent

Deeks goes under cover to find information on a notorious arms dealer trying to get back in the business.

Parley

When a woman connected to a bizarre case turns out to be an undercover agent from Hetty's past, Callen questions Hetty's motives.

Raven & the Swans

When the body of a cartel boss is stolen after a successful special task force mission, the team investigates a potential leak and find the missing remains.

Resurrection

The team investigates when cyanide in a communal water jug kills a lieutenant and leaves a Navy pilot in serious condition.

Purity

The Los Angeles team and NCIS: Red continue their urgent search for an elusive terrorist before he disappears.

Red: Part Two

Callen and Sam work with NCIS: Red, a mobile team of agents, when a murder weapon in Idaho matches one used in a national security case in Los Angeles.

Sam fears for his family's safety when his wife is called to resume a former CIA cover after a case suggests ties to the infamous Sidorov and his stolen nuke.

Wanted

Sam helps an Afghani elder and former friend search for his missing nephew; Callen worries that Sam is overly invested.

Lokhay

An investigation leads the team to question the only survivor of a terrorist organization; Deeks and Kensi follow a trail into the woods.

History

The members of the team go under cover as an elite tactical force in order to investigate a crime linked to a cartel kingpin.

Kill House

Callen must infiltrate a network of Chechen terrorists who are recruiting fighters to join their cause as they plan their next attack on the U.S.

The Chosen One

Agents in Los Angeles' Office of Special Projects team track criminals who threaten national security.

Gunmen in costumes orchestrate a strange and brazen heist that could impact the U.S. economy; Granger insists on a partnership with a hesitant Kensi.

S4 E9 | The Gold Standard

E24 | Descent

E23 | Parley

E22 | Raven & the Swans

E21 | Resurrection

E20 | Purity

E19 | Red: Part Two

E18 | Red

E17 | Wanted

E16 | Lokhay

E15 | History

E14 | Kill House

E13 | The Chosen One