The brave new world of the future! Earth has gone through its third energy revolution, and now all power is based on a new invention called 'the Shizuma Drive,' a complete recyclable and pollution free energy system created ten years ago by a group of five scientists. These drives power everything. There is no more danger of nuclear radiation, or waste of rare resources such as petroleum.

Even though it sounds like an ideal society, there are still problems. There are two major powers who are locked in a fierce struggle. The first is the Big Fire Organization, which is a very powerful evil organization that threatens to conquer the world with the help of their numerous robots.

The only people capable of putting a stop to their plan is the International Police Organization. They consist of a team of agents, all having their own special powers. They also have the most powerful robot in the world, Giant Robo. Giant Robo is controlled by Kusama Daisaku.

Source: Translated from the Anime Reference Guide, Vol. 2, No. 1, 1993, page 30

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Side story: Giant Robo Gaiden Ginrei
Other: GR: Giant Robo