Nekronopolis is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. It was the dark and corrupted version of the city of Echidnaopolis. An evil and nightmarish reflection of the achievements of echidna society, it was meant to serve as the capital of the new order of world conquest brought about by Enerjak. However, due to the arrogance of his powers and lack of foresight, the city was never permanently established thanks to the Fire Ants. The city was then recreated from the former site of Echidnapolis nearly four centuries later when Dimitri re-emerged, however it again ceased to exist when Enerjak was defeated by the combined efforts of the Fire Ants and Locke.