An attempt to weaponize a machine capable of opening portals to other worlds fails, and instead creates an exponentially expanding "bubble" of fractured space-time. A team of specialists must enter the disturbance and make their way down a rabbit hole of increasingly more dangerous alternate realities in the hopes of finding and shutting down the machine which created it. However, someone-or SOMETHING-seems determined to stop them before the "bubble" engulfs the entire universe itself.
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.