A Robot Master is a Super Robot that contains special abilities the can use to protect Earth or conquer it. Robot Masters are one of the many capital species of machines as well as Reploids or other robots. Robot Masters, like Reploids and Mechanoloids, come in variety of types, sizes, elements, and forms; each with a different look. Some Robot Masters can even download and use other Robot Masters' signature moves, like Mega Man. Some Robot Masters are incredibly ridiculous, like Door Man or Mail Man. Some can be rather incredible, like Ra Thor.