After having an encounter with the last of the Old Gods, Zielo, Sonic and co are forced to play a game with said God which lead them to getting thrown from Angel Island were forced to fight Sonic's friends, Amy, Tails and Knuckles, who had become Soulless.

Now after poor Tin Can got flooded by a tidal wave from Angel Island falling into the ocean, everyone is stared down by a watery beast.