The Wumps lead a bucolic life on their own planet. One day they are invaded by the Pollutians, who it seems have overdeveloped and destroyed their own world. The Wumps flee in terror, as brigades of bulldozers and armies of machines are unloaded from the spaceships. Eventually the Pollutians outgrow the Wump's world and quickly depart for yet another. The Wumps are horror-stricken by the mess. Yet amid all the destruction, the Wumps find a patch of green and begin to rebuild.