He's a reconstructed version of Metal Sonic that was built by Starved to hunt for bigger Mobians to cook, even having a massive furnace (hence his name) installed on his chest for him to trap and cook Mobians inside of it, sometimes even while they're still alive. He was used to kill Sonic in Stardust Speedway, luring him into a trap where he raced against him through the city before faking a malfunction and then reaching the ends of Stardust Speedway without Sonic's knowledge to ram into him as