Black Doom has returned to hunt Sonic and friends! Dr. Eggman contacted Black Doom and he was interested. Without Sonic, he can take over the galaxy and make a deal with Eggman that he will leave the Eggman Empire alone.

Dr. Eggman has tricked Chaos from being a peaceful person to again back to the dangerous villain. He will encounter you sometimes, but not much as Dr. Eggman. But be careful though, Dr. Eggman and Chaos CAN battle you at the same time!

The main villain who teamed up with other villains to capture Sonic the Hedgehog. He is after all seven Chaos Emeralds, to finally build the Eggman Empire. He encounters you from time to time, so better watch out.