The continuing adventures of Cosmo-Knight Caleb Vulcan carry our hero across space and time to be pitted against one enemy after another. The first is the wicked Royal Kreeghor, Geryon, commander of the Shadowstar, a dreadnaught rumored to carry a star-slaying weapon capable of snuffing out entire solar systems. Then Caleb must once again face the mad Elf, Elias Harkonnen. A soulless psychopath who quit the Invincible Guardsmen because they did not offer him enough opportunities to kill people. A mad dog who relishes the thought of adding a Cosmo-Knight to his list of illustrious victims.