Since Toei requested a plot for Tokusatsu TV series from Yokoyama, he wrote this manga. Yokoyama made the setting "Giant Robo follows only a hero" for differentiation with his Tetsujin 28 which everyone can control.
The secret society "Big Fire" to scheme to conquer the world is furthering Project GR. The special investigation organization of the United Nations dispatches an agent in Country T to interfere with the plan. Daisaku Kusama, the Japanese tourist, is mistaken for the agent, and is abducted by "BF".
Daisaku Kusama comes back alive to Japan barely with GR1. However, "BF" plans the attempt on Daisaku's life to recapture GR1, and they let GR2 and GR3 attack Tokyo.
The bomber carrying a hydrogen bomb crashes into Japanese waters. The hydrogen bomb has already been deprived by "BF" though the bomber is recovered at once. "BF" requires that GR1 should be exchanged for a hydrogen bomb.
- Daisaku Kusama: The Japanese boy who was going to go to Country T to study.
- Azuma: The chairman of Japanese branch of the special investigation organization of the United Nations.
- GR1: The robot for land battles made by Big Fire.
- GR2: The robot for naval battles made by Big Fire.
- GR3: The robot for air battles made by Big Fire.
- Giant Robo (tokusatsu), a 1967 live-action series based on the manga. Also known as Johnny Sokko and his Flying Robot.
- Giant Robo: The Day the Earth Stood Still, a 1990's direct-to-video series inspired by the manga.
- Giant Robo: The Day the Earth Burned, a 2006 manga series from the creator of Giant Robo: The Day the Earth Stood Still.
- GR: Giant Robo, a 2007 re-imagining of the original manga.
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