Four years after the Origins Arc, Sonic and Tails are in a race against Dr. Robotnik for the Seven Chaos Emeralds, Knuckles is on a mission to restore the Master Emerald, Amy is protecting a small bird from a robot known as E-100 α, one of Robotnik's robots goes rogue, and a big cat keeps losing his frog. At the center of it all is a mysterious echidna tribe which Knuckles is a descendant of, and a creature made of water known as Chaos.
