When Sonic the Hedgehog was little and living with Longclaw on the island, a tribe of echidnas attacked their home for Sonic's power. While trying to escape, Longclaw was heavily injured by an arrow shot at her. As the tribe approached them, Longclaw sent Sonic away from the island with a Ring to Earth, warning him to never stop running. Once Sonic entered through the Ring to Earth, the portal closed, leaving him stranded.
- Sonic's island is based on the tale of Christmas Island from the Sonic the Hedgehog Technical Files, but its appearance is based on South Island.