I'm not sure if any of you know this, but Sonic first appeared in a Superman comic. He was originally brown. One day when he was digging and tunnelling, he found the secret laboratory of Dr. Ovi Kintobor. Sonic thought he was a pretty cool guy and stuff, so he hung around. He began training on a treadmill for long periods of time. Eventually, his maximum speed was 366 mph, and going this fast turned him blue from oxygen or something. His feet were killing him, so the Dr. made him some special shoes (which are the ones we are all familiar with). The Dr. was also experimenting with the emeralds he found while exploring. He said that they collected all the hate and evil in the world and stored it. Through extensive testing, he emeralds finally exploded(not the actual emeralds, the evil) and turned Dr. Ovi Kintobor into Dr. Ivo Robotnik. We then find out later that the emeralds were in fact the Chaos Emeralds.

This story was in a Superman comic as a short.