The Wumps live on their own beautiful planet and have a pretty pleasant life until the Pollutians arrive, bringing with them progress : buildings, roads, smog, dirty water, noise, and social ills. When they pollute the planet so badly that even they can`t stand it, the Pollutians fly off in their spaceships to colonize another planet, and out come the Wumps from their hiding places, ready to reclaim their sullied world.