It's been ten years since you, Rouge, Amy, Sonic, Tails, Knuckles, Eggman, cream, Vanilla, and Shadow have seen each other. Amy and Sonic get married and have three kids, to which Silver follows up with a family of his own after marrying Koko the Headgehog and also having three kids.

Knuckles and Rouge gets married and have a kid, Cream is all grown up, and Eggman is still evil, but not as evil as he was 10 years ago... However, no one had seen you after you disappeared to save everyone ten years ago.

One day, Sonic, Amy, Spike, Zac, and Rayna, we're chilling out in a park when they notice something, more importently, someone hoving over the park [that person hovering over the park is you, but mostly unrecognizable]

Sonic: "Huh? Who is that?"