When Sonic is seemingly killed during a battle with Eggman, his friends are devastated. With their friend's passing Tails devotes all his time to making machines, Knuckles returned to guarding the Master Emerald, becoming a recluse except for when Eggman attacked, and Amy was affected most of all, desperately turning her anger and grief toward fighting Eggman 24/7.
A year later, things look bleak when Eggman reveals his latest creation: a seemingly unstoppable being he calls "Project Blitz" - a seemingly mindless beast created from a mixture of Sonic's DNA, various enhancing substances, and of course, technology. The only thing is, while he couldn't possibly be Sonic, no matter how much they wish otherwise, Amy's gut is telling her that there's definitely more of a relation than just being made from her crush's DNA - especially since the so-called "mindless beast" seems to recognize her...