 600 million years ago, ancient mankind created a rebellious robot named Bacchus Wrath. Riki (Kingranger) banished Bacchus Wrath from earth. In year 1999, He returns to earth with the intention of wiping out all human life and bring about machine rule. Chief Counsellor Miura revived super energies that have been given birth by the lost civilization on Pangaea 600 million years ago. Assembling pieces of a stone plate uncovered three years ago, the secrets of "superpower" has been revealed. Miura builds a pyramid that generates Tetrahedron power-power that allows five U.A. officers to transform into Ohrangers.