When a peacekeeping effort between Dr. Light and Dr. Wily go haywire, it’s up to Mega Man and his robotic companion Rush to traverse the universe and defeat the Robot Masters in the third installment of the Mega Man series. Mega Man 3 is a side-scrolling action-platformer developed and published by Capcom for the Nintendo Entertainment System on September 28, 1990 , November 1990 and sometime in 1992 .