Metal Knuckles

Metal Knuckles, or Knuckles Metal and Knuckles Metallix is a robot version of Knuckles the Echidna.

History
Metal Knuckles is Knuckles’ robotic copy. Seeing how he was a hindrance to his plans, Dr. Eggman prepared Metal Knuckles as a secret weapon to overthrow Knuckles. Metal Knuckles uses the same power plant as Metal Sonic, and shares abilities with Knuckles. After his first use at the Ex World Grand Prix and his loss against Sonic and his friends, Doctor Eggman decided to deactivate him. But recently, he upgraded him and let him join with Metal Sonic and Tails Doll to go and stop Sonic and his friends once and for all.