guiltar the evil counterpart of optimus and megatron was thought to be destroyed by the combined force of galvatron and rodimus prime but little did they know when he was destroyed he fell back into the abyss he emerged from to fall back into the hands of his creators the quintessons. they had to take his central processor out and build a new body for him a black version of the autobot leader optimus prime.''riseeee nemesis prime and destroy the evil autobot forces that destroyed you''the quintessons screeched ''yes my masters'' replyed nemesis prime.