When the earth was almost destroyed, human beings were wiped out. But they left behind two heirs. One, known as Androids, was highly intelligent and unpleasant. The other, called "Simps" by the Androids, was large, strong, and easy-going. When they fought for use of the earth, Simps won -- and Androids were forced underground. But when aliens declared war, the two groups had to work together.