The Insider.com

NCIS: Los Angeles' highly anticipated season finale is tonight, and the show's stars dish that not everyone will survive the nail-biting episode, as the Insider goes behind the scenes of the intricate three-part finale!

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"This year is a cliffhanger and I think there are a lot of things people aren't expecting," LL Cool J (Sam Hanna) reveals. "Really not expecting ... actually I'm not keeping the fans guessing, we're all guessing -- we don't know! All bets are off ... everybody is fair game. Anything can happen."

So does he ever get nervous about the fate of his character?

"I mean you never know. You might walk in one day and find out that they found you on the highway. You gotta keep your fingers crossed, and wish for the best," he smiles.

Video: 'NCIS: LA' Teams Up with 'Hawaii Five-O!'

"In the last episode, people perish," Daniela Ruah (Kenzi Blye) confirms.

"Everything in the last episode is definitely going to be a shocker. You don't expect certain people to come back, to come up, to be in places where they are at the last minute and then something happens ... makes no sense, but it will when you see it," she laughs.

Check out the video for an action-packed clip from tonight's episode, as well as Ruah and Eric Christian Olsen (Marty Deeks) commenting on what it was like going undercover as a married couple -- something "Densi" fans have been hoping for for a long time!

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Don't miss the NCIS: Los Angeles season finale tonight at 9 pm on CBS.