This big-budget animated feature from Sweden, drawing upon some of that country's best known performers, is a children's adventure story with a cautionary ecological theme. The director drew his inspiration from such diverse sources as The Tempest by William Shakespeare, Robinson Crusoe by Daniel Defoe, and Machine Island, by Jules Verne. In the story, Prospero has been exiled from his home, and is living on the island of Melonia with his daughter Miranda, an albatross named Ariel, and a fruit-monster called Caliban. Just as Caliban has finished creating something called "power soup" from the emanations of a local volcano, a crew of ne'er do wells crash-lands. They are from Plutonia, a polluted industrial planet given over to entirely to making weaponry, and they have come to steal Caliban's creation. Their plan is to take over the world Melonia is on and make it just as ugly as their own. Prospero and his kin band together to rescue the children on the industrial planet, who have been enslaved to work in the munitions factories, and at the same time put a stop to the evil plans of the Plutonians.