In the year 2000, there were robots aplenty. Since human beings no longer worked, there was a wide assortment of robots, big and little, fat and thin, tall and short, to perform every conceivable menial task. But nowhere was there a robot like Gangor, the Monster. Created by the arch-criminal Patch, Gangor was actually a gang of robots – 47 robots rolled up in one! By day, these robots walked the streets as a group of helpful machines. By night, and under orders from Patch, they linked together, one behind the other, to form a seemingly endless chain – a mechanical centipede capable of executing the most monstrous crimes! For once it seemed that even Astro Boy himself might have met his match. In a thrilling battle at the bottom of the sea, Astro Boy challenges one of the most cunning monsters ever invented!