Corporate greed has spawned pollution that is destroying the Earth. An experiment with longevity has made it possible for five survivors to transport the Earths population to other planets, but one group of radicals wants to stop the exodus and reverse the pollution. The five survivors are called Explorers and at the present time they are over 1500 years old. Lazarus is one of the oldest and he is missing. Susan searches for him and between the two of them they come up with a way to save the Earth.