The damage caused to the Zones (alternate realities) in the Endgame story-arc in the regular "Sonic the Hedgehog" series causes Echinopolis (the capital of the Floating Island) and Echidna's ancient enemies the Dingos to both return to the Floating Island after they were evacuated to The Hyper Zone by Guardian Hawking some 200 years earlier to escape the radioactive fallout of a Dingo missile strike. But both cities are attempting to return to the same location which could cause them both to be destroyed. Knuckles meets his mother and Julie-Su, and deals with the warring General Stryker. Echidnapolis is the city that survives, leaving the Dingos stranded there and causing a housing problem. The story also told the history of the disappearance of the Echidnas and introduced Constable Remmington and Grandfather Hawking.