Peace has returned to Atlantis. Governments are seeking to learn the secrets of the ship beneath the ancient city, and not all are from Earth. A mistake has revealed the location of the Earth and its precious resources to the inhabitants of The Core, ancient home system of the Olympians. The race is on. Can Atlantis rise one last time to defend the planet it sought to conquer?

Following immediately on from the event in Atlantis - War of the Titans, the united forces of Atlantis and the Titans must prepare the Arcanadia to hold off the unknown threat from The Core. Will other Olympians or friendly Asgardians find them, or will they face the military might of the Kukulcan Empire and its Emperor?