With Sage captured by a corrupted Metal Sonic, the favorite daughter of Dr. Eggman is about to be deleted. The only way to survive? Combine forces with her “sister,” Belle. As the two overcome their pain and fight to survive, they find themselves caught with Sonic under the whim of a mysterious ghostly figure. Imprisoned in its sinister lair, will the children (and ultimate enemy) of Dr. Eggman be trapped forever beneath the harsh ice?