Man for his "cowardice". Dr. Light asks Mega Man to investigate strange energy readings on a nearby island. 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. After Mega Man defeats the four Robot Masters, he returns to the lab and brings Dr. Light the energy cores he retrieved; Dr. Light examines them and realizes that they are a powerful form of energy, which Dr. Wily must not have in his possession. After they leave the lab, the robot awakens and sees the energy cores, becoming enraged and flies off into the distance. Mega Man follows him to a mine shaft on the other side of the globe. After battling the robot, Proto Man shows up and tells Mega Man that Dr. Wily's new fortress, "Wily Tower," is just ahead. Mega Man goes there but is captured by one of Wily's giant robotic creations. The robot saves him and introduces himself as Duo. Duo explains to Mega Man that the purple orbs are "Evil Energy" and he has been traveling the universe, tracking down this energy and trying to destroy it before it engulfs the entire world. However, Wily Tower has a barrier around it that prevents him from taking out the source. Duo tells Mega Man to destroy the four other Robot Masters that hold the key to the barrier (Astro Man, Sword Man, Search Man, and Aqua Man), while he collects and extinguishes the rest of the world's Evil Energy. Once the remaining Robot Masters are defeated, Wily Tower's barrier is lifted and Mega Man makes his way through it, defeating the hordes of robotic henchmen inside, including Bass, who uses a piece of the Evil Energy to amplify his powers, and ultimately, the evil doctor himself. The "Evil Energy" is destroyed before it is allowed to spread throughout the world,