[2] Star Boy is a member of the Legion of Super-Heroes, a group of young heroes living a millennium in the future.

[4] Star Boy is expelled from the Legion for killing his girlfriend Dream Girl's ex-boyfriend Kenz Nuhor in self-defense.

[5] Following Zero Hour: Crisis in Time!, which reboots the Legion's continuity, Thom Kallor discovers that he is destined to travel back to the 21st century, assume the mantle of Starman, and die.

[8] In Final Crisis: Legion of 3 Worlds, it is revealed that Starman was sent to the 21st century to resurrect Superboy and carry out R. J. Brande's will.

The version of Thom working with the Justice Society of America can travel between universes using a combination of his mass-controlling powers and his uniform, a map of the multiverse created by Brainiac 5.