Inhabitants of Reptilon, a planet of the exact opposite orbit of earth, are fully advanced humanoid dinosaurs. But they've depleted their planet of all its resources, and now need to find a new home planet and establish themselves at the top of the food chain. Once they launch their attack fleet through space toward Earth, government leaders from across the globe learn for the first time that they aren't alone in the galaxy, and their very existence is threatened by total annihilation.