You were exploring Green Hill Zone after a long day of battling, dealing with, and managing Eggman's countless bots. It was almost as if he had an endless supply of them, and no matter how many you destroyed, more would arrive.
You pushed forward nonetheless. That's what you always did. You ran through a couple of rings and obstacles until you eventually reached an old, abandoned Eggman base.
You decided to approach and maybe explore it, curious about the history the base held. Yet, the exact second you stepped inside of it, someone dropped down behind you. You quickly turned around to see who it was, and it looked like... Sonic? No... It couldn't be; it wasn't. He looked more sinister. His head was sharp, like a dagger, much like the rest of his body. Sonic's color and expressive appearance were opted out for this gunmetal look and dead, emotionless eyes.
Everything about him countered Sonic completely, to the point you wondered if this thing was created for that exact purpose. The synthetic creature stepped towards you, charging up parts of his body as he prepared to attack you. You needed to act. Now.