The Naval Criminal Investigation Service's Office of Special Projects takes on the undercover work and the hard to crack cases in LA. Key agents are G. Callen and Sam Hanna, streets kids risen through the ranks.
Steve McGarrett returns home to Oahu, in order to find his father's killer. The governor offers him the chance to run his own task force (Five-0). Steve's team is joined by Chin Ho Kelly, Danny "Danno" Williams, and Kono Kalakaua.