Complex biomechanical hybrids, made with alien gene-splicing techniques and spawned in an underground facility deep below New Mexico, threaten the world, while the U.S. president rages against the scientists who have kept him in the dark. Human science proves ineffectual against the hybrids, and humanity's only hope lies in the first generation of hybrids, Mark and Gina, who are unaware of their own origin and hidden superpowers.