Knuckles the Echidna is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He is the last Mobian echidna known to inhabit Sonic's World and the Guardian of both Angel Island and the Master Emerald. While his primary concern is protecting his home from invaders, certain threats, particularly those posed by Dr. Eggman, have been enough to persuade him to leave the island.