In Chiquito, capital of Palombia, there are nasty rumours flying of numerous orphans and poor kids going missing. And indeed, one evening, the son of a rich family is kidnapped along with a handful of street urchins after he sneaked out of school. The children are soon put to work in a clandestine gold mining camp. But the illegal prospectors are horrible polluters, and that’s already brought them into a very angry Marsupilami’s sights …