Knuckles the Echidna is the Guardian of the Master Emerald, but ever since Dr. Eggman and Sonic first appeared on Angel Island, trouble has followed. Knuckles still doesn’t fully trust Sonic, so he’s been watching over the Emerald constantly to ensure nobody – robot or hedgehog – gets their hands on it. Now, just as Knuckles finds a safe location, a mysterious figure appears in the shadows…