Silver the Hedgehog, and his sister Venice, return to their time to find it restored to beyond what they've dreamed for a peaceful future. But there was one problem: Mammoth Mogul has disappeared after Iblis' destruction and Mephiles' defeat. Together, they must team up with Silver's crush Blaze, her sister Marine, and the entirety of Team Sonic to search for him. But Silver will have to meet debuting allies such as the Freedom Fighters, and face enemies new and old, including Dr. Robotnik's new mercenaries the Babylon Rogues, the returning Eggman Nega, and the invincible Enerjak all in efforts to find Mammoth Mogul and defeat him. But Mogul has found a being that is beyond time and space itself that could help him make the timeline how he wants it: the Time Eater!
