Star Boy is a member of the Legion of Super-Heroes, a group of young heroes living a millennium in the future. He was born to astronomer parents on an observation satellite orbiting the planet Xanthu with the ability to temporarily increase the mass of an object, up to the mass of a star. Although he temporarily acquires Kryptonian-level powers similar to those of Superboy when he was caught in the tail of a comet, these eventually fade (leaving only his original density-increasing power). Early in his Legion career, he travels to the 20th century to meet Superboy. Star Boy is expelled from the Legion for killing his girlfriend Dream Girl's ex-boyfriend Kenz Nuhor in self-defence, in violation of the Legion's rule against killing. After this, he and Dream Girl join the Legion of Substitute Heroes before returning to the Legion. Although Star Boy originally wears a purple uniform with a white cape and five-pointed yellow star on his chest, his best-known costume is a full-body starfield suit with white gloves and boots. After the events of Zero Hour and the death of Kid Quantum, Xanthu's original representative to the Legion, Star Boy joins the Legion. He does not get along with Leviathan, partly because Leviathan blames himself for Kid Quantum's death and sees his replacement as a reminder of his failure as a leader. In addition to his mass-increasing powers, Star Boy temporarily acquires several Kryptonian-like powers and the ability to breathe fire after spaceship accidents. However, he finds these abilities difficult to control.When Xanthu leaves the United Planets, Star Boy and fellow Xanthian Legionnaires (Kid Quantum and Monstress) spread the word that the government of their home planet has been deceived and are astonished at the decision to remain with the Affiliated Planets.
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