The story of
Mega Man III consists of the hero
Mega Man battling the evil scientist
Dr. Wily, but is different from version to version: in the US manual, Wily using a converted
oil platform in the middle of the ocean to draw energy from the Earth's core to power a new machine. The plot of the Japanese version the game, supported by supplementary material, has Dr. Light's laboratory receiving many bad news reports from all over the world, from industrial anormalities to transportation failures and abnormal weather conditions, and an army of robots had gone crazy. Light finds out that the supercomputer that manages people's everyday life is malfunctioning and was tampered with by Dr. Wily via jamming waves, so he sends Mega Man,
Rush, and Eddie to find him and stop him. Mega Man defeats four of Dr. Wily's old Robot Masters, Gemini Man,
Snake Man, Spark Man and Shadow Man, and after taking them out, he enters Wily's castle, where he has to fight four of the Robot Masters created by Dr. Cossack, the Russian scientist who Wily had blackmailed earlier: Drill Man, Dust Man, Dive Man and Skull Man. After defeating the second set of Robot Masters, Mega Man finds Dr. Wily attempting to escape. A powerful robot designed specifically to destroy the hero,
Punk, confronts him, but after a tough battle, Mega Man is able to defeat him. Wily's fortress emerges from the ocean and Mega Man heads in there, defeating him once again. ==Gameplay==