Using the reality-bending properties of the Skull Egg Zone and the Wily Egg, Dr. Eggman and Dr. Wily managed to create Time-Clones of Wily's Robot Masters, most of whom became the Robot Master Army. The Copy Robot and Genesis Unit were also Time-Cloned and sent to attack the party of Mega Man, Sonic the Hedgehog, Proto Man, Tails, and Rush after they entered the Skull Egg Zone. Proto Man and Mega Man were the first to recognize that an unusual process was being employed, as robots from their world had only previously returned from complete destruction due to the power of Ra Moon. The Genesis Unit later returned as part of the army, who engaged the heroes and their expanded force of allies outside the Wily Egg. While the heroes managed to hold their own, it quickly became evident that the d