A huge armada of spaceships approach Earth. Two aliens in human form, one a male, the other female, descend to the surface in transport pods and are immediately captured by U.S. soldiers. At the same time, giant robots land at major cities throughout the world and remain motionless until threatened, at which time they prove to be impervious to all forms of weaponry and demonstrate the ability to destroy any such menace. Whilst in captivity, the male reveals that his duty was simply to escort the female. Meanwhile, the female, Skye, develops a trust in Josh Myron, the soldier that first discovered her. It is to Josh that she discloses the purpose of her ominous mission. Watching from afar, her race has come to the conclusion that humans have advanced too far with weaponry and will become a danger to the entire galaxy in the future. Her job is to determine, by sundown, if human life should continue to exist. She solicits Josh's help to accomplish this goal. Reluctantly accepting the challenge, Josh sets out with Skye on a danger-filled journey to discover the value of human life, all-the-while being hunted down by the army that has decided that the key to survival is holding the aliens hostage.
