Taking place in the 21st century (the ambiguous year 20XX), two alien robots engage in a battle in the depths of space. Ultimately, both of them plummet towards Earth, critically injured. On Earth, humanoid robot Mega Man and his robot canine companion Rush are caught in a skirmish with his rival Bass, who still wants to prove himself to be stronger than Mega Man. Thanks to the timely intervention of his sister Roll, who was bringing a message from his creator Dr. Light, Mega Man manages to subdue Bass long enough to leave. Bass swears that he will get back at Mega Man for his "cowardice". Dr. Light asks Mega Man to investigate strange energy readings on a nearby island.[8] On the island, Mega Man finds Dr. Wily flying away with a strange purple orb. Before chasing him, he sees a damaged robot and asks for Dr. Light to pick it up and try to repair it. Dr. Wily then releases four new advanced and modern Robot Masters to combat Mega Man: Frost Man, Tengu Man, Clown Man, and Grenade Man. Each time he destroys one, he receives a purple orb like the one Dr. Wily captured. Each of the Robot Masters are empowered with a strange energy, and it seems that this power comes from the new energy cores that Wily has infused them with.