The electrifying twists and mind-blowing turns have paved the way for a showstopper of an ending. It's the final season of Hawaii Five-O, and the best police force ever assembled is going out with a bang. And they're taking every  thief, thug and cold-blooded murderer with them. It all culminates in a gut-wrenching showdown between Steve McGarrett and his ultimate nemesis, in a series finale you don't want to miss.