Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.
A female scientist and two children are accidentally transported into a future dominated by primates.
Earth is invaded by the criminal organization known as Makuu, led by Don Horror, who had first destroyed a space colony near Earth. Don Horror wants to dominate the whole universe, and the Earth represents an obstacle that he has to overcome by turning it into a domain for all evil. In response to Makuu's attack, Space Sheriff Gavan of the Galaxy Federal Police is deployed to Earth to defend his mother's home world.
