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Callen, Sam, Kensi and Deeks go undercover as an elite tactical force in order to investigate an ambush tied to a cartel kingpin with terrorist connections.
Callen goes undercover to infiltrate a network of Chechen terrorists who are recruiting foreign fighters to join their cause and planning their next attack in the U.S..
An NCIS: LA investigation leads the team to question a lone survivor of a former terrorist organization, while Kensi and Deeks follow the trail into the woods.
Season 4 of NCIS: Los Angeles begins where the third season ended with Callen facing the fallout of shooting The Chameleon. He forcefully continues investigating alone and is kidnapped after by hit men. The team tackles many exciting and difficult cases including investigating the death of a former Marine killed in a drone strike in the Middle East.