The Anaz-voohri have returned from the stars after eight hundred years, to claim the planet of their ancestors... a blue orb named Earth. Since he witnessed the abduction of his baby sister by an alien creature, Zack will stop at nothing to rescue her, even if it means joining the Special Forces. But Tia Vargas, the reckless Amazon training the secret unit for a highly classified mission, has no use for this handsome, rebellious recruit, at least not on the battlefield, until Zack's farfetched stories prove to be true, and tragedy strikes.