The adventure begins as Sonic races to protect the world from bad guys old and new! In the aftermath of his latest battle with Dr. Eggman, rogue robots are on the loose and new foes are on the rise. But where is the evil doctor and what secrets will Sonic discover during his search? One thing’s for sure: he'll need plenty of help from Tails, Knuckles, Amy, and new allies Tangle the Lemur and Whisper the Wolf.
A stormy night. A plane crash. A deserted island—or so it seems. Sonic and Tails find themselves castaways, surrounded by robots hardwired to target them! That's no island—it's the weathered hulk of the Death Egg, and it's crawling with scrapped, rusted, and malfunctioning Badniks! Each and every one of them was created by Eggman to destroy that meddlesome hedgehog, but the mad doctor left other creations as well. Lethal, personal, familiar creations. What other secrets does the crumbling battle station hold? Are all of Eggman's monsters doomed to follow their programming, or can they step out of their maker's shadow? And where can a hungry ’hog get a chili dog around here?