Austin Jones knows that something is being hidden from him and realizes that he was right all along when he's taken by two mysterious men to an underground city beneath Paris. He's told there that he's not a human like he believes himself to be but an alien from a planet that shares orbit with Earth, invisible by a force field that surrounds it. He amazes himself with all the wonders he finds in that subterranean secret world and soon finds himself with the mission of saving the human race but for that, he will have to go to the planet behind the sun and face his people's enemy with the help of his two new best friends.