Infinite survived the final battle with Sonic and Gadget, but at a price; long term memory loss. The jackal's old self has awoken in a world of destruction, mistreat and confusion all over one misunderstanding. Only one certain red wolf is determined to help, but what journey or cost can redemption bring?

Metal Sonic: a machine that wishes desperately he wasn't a copy, of either life or of Sonic the Hedgehog. Through an adventure around the world as he seeks the power to come to life, he must come to grips with both what he is and what he wants to be.