Knuckles Metallix was a villain from Sonic the Comic, which was the United Kingdom's official Sonic magazine - in contrast to Archie comics. Knuckles Metallix was a variation of the Metallix series and has a design very similar to Metal Knuckles from Sonic R (however Knuckles Metallix actually pre-dates Metal Knuckles), unlike most other Metallix he was fully loyal to Dr. Robotnik and was designed around Knuckles the Echidna rather than Sonic the Hedgehog.