Attack on the Master Emerald!With all of the Chaos Emeralds in the world going missing, Sonic, Amy, and Tails travel to Angel Island to warn Knuckles that the Master Emerald is in danger. Although the four friends together are near-unstoppable, everything changes when Angel Island passes beneath a powerful storm, separating the team!Trapped underground, Amy and Sonic find themselves facing eerily familiar opponents, while on the surface Knuckles and Tails are left to weather the raging storm. But the tempest isn't the only danger on the island—in the midst of the chaos and confusion, a shrouded figure has arrived with their own plans for the Master Emerald... A new arc on the Road to 100 starts here!