THE TALES OF THE BIZARRO CREW
Basically, in the early comics, Penders played with the idea of Sonic meeting various dimensional counterparts. One of these was the Sonic who would futurely be Scourge.
Things weren't really bad back then, to be honest. It was just fun, silver age-esque crossovers. You'd typically have stories with Evil Sonic and his friends removing all their leather clothes so that they could pass as Good Sonic and friends, then do shit.
Problems began after the Year in Space arc. After Sonic returned to Mobius, Antoine had a scar and was suddenly all SERIOUSFACEBZNS. The original plan was to have Antoine decided that he had to be serious during the year that they were fighting Eggman without Sonic, and had gotten the scar from tripping on the kitchen with a knife. However, fan rage over bland new argh Antoine was so much that (IIRC) Penders decided to do a quick retcon to it all- Antoine had been kidnapped by Evil Antoine, and the two had switched places, with our Antoine in Evil Mobius.
Meanwhile Evil Sonic also decided to return and do more shit in Mobius, basically making out with every girl (which made Sonic very awkward after) and ending up hooking with Rouge, the both of them trying to steal the Master Emerald. At this point, Ian Flynn entered the comic. Deciding that the concept of anti-Sonic had worn itself out, but was now too integral to the series to just kick out, he and Spaz (IIRC Spaz was the one to suggest it) retooled him as Scourge. They considered just making him Ashura, but they felt Ashura is basically a PD Character now.
Scourge basically goes green by trying to go super, and as he is now a green bastard, decides Sonic is not the name he wants; gets defeated by Sonic later on, who says Scourge is just a bully who, considering he is Sonic, could do much more; Scourge takes this to heart, returns to his Mobius, kicks the shit out of everything and names himself King, as well as forcing everyone to take on new names and even appearences to distinguish them from their Mobius counterparts.
Basically, he was a lame characetr who then got to be a lame recolour, so now he's fighting hard to be seen as his own character. I actually like him- reading his stories is basically reading "what if Sonic decided to be a bastard now", and that's fun.
Plus I just love how deranged he looks in the cover.