When Steve McGarrett returns home to Oahu to find his fathers killer, the Governor offers him the chance to run his own task force: Five-0.
Steve McGarrett (Alex OLoughlin) comes to Hawaii to avenge his fathers death, but when the Governor offers his own task force, he accepts. He picks up team members on the way: Danny Williams (Scott Caan), the head detective on his fathers case; Chin Ho Kelly (Daniel Dae Kim), a former Honolulu Police Department Detective who was fired for accused corruption and McGarretts fathers old patrol partner; Kono Kalakaua (Grace Park), a Cadet at the Police Academy whos one week from graduating; Lori Weston (Lauren German), entry to Five-O temporarily; Catharine Rollins (Michelle Borth), a girlfriend of Steve; and Captain Lou Grover (Chi McBride), a former Chicago Police Department Head of S.W.A.T.
Hawaii doesnt have its own state police force, but the Governor has set up a special task force, which becomes known as "Five-0", to investigate serious crimes on the islands. Reserve Naval officer Steve McGarrett (Alex OLoughlin) heads the team with Danny Williams (Scott Caan) as his second-in-command, and together they tackle a range of crimes with more far-reaching consequences than those dealt with by the Honolulu Police Department, including terrorism and serious organized crime.