Hawaii Five-0's most notorious fugitives are invading paradise for the season 4 finale.

Will Nick Jonas Makes Grover Go Rogue On 'Hawaii Five-0'? Chi McBride Teases 'Intense' Finale & New Side Of Grover

Wo Fat (Mark Dascascos) and Ian Wright (Nick Jonas) are back on McGarrett's (Alex O'Loughlin) turf, and the younger baddie will be stirring up the most trouble during "O ka Pili 'Ohana ka 'Oi (Family Comes First)."

The young genius turned terrorist is in need of a million dollars and he has extreme dislike for Captain Grover (Chi McBride) will fashion him with a daring and diabolical plan. After kidnapping the SWAT captain's daughter, Ian will have the leverage to make Grover do whatever he commands - including attacking Five-0 (see video below).

Wo Fat & Nick Jonas' Ian Wright To End 'Hawaii Five-0' Finale With A 'Big Shocker'

Meanwhile, McGarrett will have his own problems to deal with. As much as the former Navy SEAL would like to recapture Wo Fat, he seems to be even more interested in understanding how the international criminal is connected to his mother. Perhaps Wo Fat's appearance on the island will allow Steve to find out the truth behind this multi-season mystery.

"It's going to be a really intense, intense episode," Chi McBride warned Access Hollywood.

Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS. Scroll through the photos above to see what Five-0 is up against in "O ka Pili 'Ohana ka 'Oi (Family Comes First)."

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Hawaii Five-O, CBS, Television