Fighting Masters

This one on one beat-em-up is set against the story of a demon lord who leads an underground campaign against a 12 star galaxy to take control of it. He conquers all of the stars' rulers and makes them his slaves except for one. Taking control of this lone hero, the player battles through the enslaved rulers and into the final battle with the demon lord, Lord Valgasu, himself. Source: Wikipedia, "Fighting Masters", available under the CC-BY-SA License.