Hawaii Five-0's Captain Grover is a big fan of playing by the rules, but the reappearance of Ian Wright will bring out the McGarrett in Lou.

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Ian (Nick Jonas) is back in paradise for the Hawaii Five-0 season finale, and the young terrorist is targeting the men who almost caught him the last time. Unfortunately for Grover (Chi McBride), Wright's latest plan involves kidnapping the SWAT Captain's daughter during "O ka Pili 'Ohana ka 'Oi (Family Comes First)."

"It's going to be a really intense, intense episode," McBride told Access Hollywood. "You're going to see a side of Grover you didn't know existed because you mess with a man's family and you take a man's child, you see a different guy. You see all ends of the spectrum - from anger to just a complete breakdown of emotion in this guy."

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With Ian demanding $100 million in exchange for his little girl, Grover will be willing to take a page from Steve McGarrett's (Alex O'Loughlin) book and toss the rules.

"This is a guy that started out with McGarrett being sort of a nemesis of his because Grover didn't exactly share his same theory about how to do police work, if you know what I mean, so you find out that when something like this happens there's a grey area that you see," McBride explained.

See just how far Captain Grover will go to save his family when Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS. Click the video below to see a preview of "O ka Pili 'Ohana ka 'Oi."

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Hawaii Five-O, CBS, Television