Note: Incorrectly listed on some sites as "The Challenge Chaos"

Synopsis: From the back cover of the DAW first edition: "They named the planet Chaos X, because one hemisphere was not in this universe - and no one who ventured there would ever return. They named the other universe Ultra, because it was beyond the laws of the Milky Way galaxy. It was only by means of Ultra's non-Euclidean physics that men could travel the starways. They named the ruler of that "immobile" planet Fury, because that was the effect of his power on people. But they were afraid to call Graig Star Gazer by any other name, because he was the space captain who was going to cross into Fury's domain and wrench his loved one from Ultra's power - and this was something that no one had ever done before except the legendary Orpheus."