Imma have to go with the Metal Virus

Unleashed he turned into a werewolf

Frontiers he just got cyber corrupted or summit like that

But here? Sonic is literally one of the last people left by the end of this. He saw Charmy, Cheese, Chocola and the rest of his friends get infected and the only thing he could do was run. At least in the last two games he had help but he can't even do that because he's powerless.