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.

The Aztecs summoned a Tyrannosaurus Rex to keep Cortes and his army out of Mexico. Now they need the Conquistadors' help to stop the T-Rex from killing them all.