Chōriki Sentai Ohranger is a Japanese tokusatsu television series and the 19th instalment in the long-running Super Sentai franchise of superhero programs. Its footage was used in the American series Power Rangers Zeo (the closing credits of Zeo referred to it as “O Rangers”).

Six hundred million years ago, Pangaea created a robot named Bacchushund, who turned on his creators. The King Ranger defeated Bacchushund and banished him from Earth.

In the year 1999, Bacchushund returned to Earth as the ruler of the Baranoia Empire, with the intention of wiping out all human life and bring about machine rule. Chief Counsellor Miura revived super energies that had been born of the lost civilization of Pangaea.

With the assembling of pieces of a stone plate uncovered three years previously, the secrets of “Super Power” were revealed. Miura built a pyramid to generate Tetrahedron power in order to allow five UAOH officers to transform into the Ohrangers.