With a storm raging against Angel Island, Sonic and his friends are in a fight for their lives! Trapped underground and separated from his friends, Sonic finds himself face-to-face with — wait — that’s not Amy?

As something terrifying happens beneath the ground, on the surface, Knuckles and Tails brave the violent storm ripping through Angel Island — although they have their own foe to deal with.

Can our heroes persevere through the chaos and keep everyone safe? Or will these mysterious figures claim another emerald… or even a life?