In a city under attack with giant robots, a lone survivor (your Custom Hero) witnesses a terrible sight that would change everything for the worst. Sonic the Hedgehog has been defeated by a powerful being known as Infinite who holds the power of the Chaos Emeralds. After Sonic's demise, Dr. Eggman has finally conquered the entire world with his massive empire, the Chaos Emeralds and the Super Emeralds under his possession! During the course of global domination, the custom character joins a large resistance of both humans and animals against Dr. Eggman's new world order and Infinite's unlimited powers of Chaos. With the Custom Hero's newfound abilities and positive outlook, he/she inspires all of Sonic's friends (Tails, Knuckles, Shadow, Amy, Blaze, Silver, Princess Sally, and others) that they can gather the emeralds and save the world, while uncovering hope that Sonic the Hedgehog may still be alive.
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