This movie is an adaptation of a book by Rodari, a famous Italian poet and writer of children literature. A group of children in the outskirts of Rome bump into a spaceship that landed nearby. Soon the event draws the attention of the media, the military and rich entrepreneurs. The spaceship is pointed as the evil to fight against by the authorities, and nobody trusts the kids, who on the other hand try to preserve the spaceship (which is actually a harmless space-cake).
After a stagecoach is robbed and the passengers murdered, a long and tangled series of surprise attacks and murderous double-crosses, leaves the coach's strongbox in the hands of the killer Lasky. It is up to the legendary hero Sartana to track down the missing money and determine just who is ultimately behind the grisly robberies and killings.