No one really knows the origins of the mutant ape-men. Many speculate that they are the result of some bizarre experiment by some wicked villain or evil scientists: An attempt, perhaps, to recreate the exact conditions that caused the ARC primates to become super-powered supremes.
What is known is that the primate freedom fighters know as ARC liberated them from a laboratory, and since then they have been working with ARC as henchmen.
While most ape-men are content to work as thugs or hired guns, a few have the personality and dedication to study under ARC ninja-master Chimp Chi, and to learn the exotic martial arts known as Ape-Ki. Those who can master the art as fast, deadly and utterly devoted to the ARC cause.