world, rocketed to Earth-Prime as a baby. After his first encounter with the Justice League, Ultraa decided Earth-Prime was not ready for superheroes and relocated to Earth-One. Post-Crisis on Infinite Earths in 1985, when there was no longer an Earth-Prime or greater Multiverse, Ultraa was retconned into being from the planet Almerac, homeworld of Maxima. Superboy-Prime The second superhero (later turned super-villain) of this Earth is Superboy-Prime, revealed as the true Superman from which all the other Supermen originate. He first appeared in DC Comics Presents #87 (Nov. 1985). This Superboy's powers first manifested around the time of the passage of Halley's Comet in 1985. Just after manifesting his powers, Superboy-Prime met Earth-One's Superman. Very soon thereafter, Earth-Prime was destroyed in Crisis on Infinite Earths #10. Superboy-Prime escaped his universe's destruction and later joined Earth-Two's Superman, Earth-Two's Lois Lane-Kent and Earth-Three's Alexander Luthor in a "paradise dimension". Superboy Prime also possesses powers far exceeding those of the modern "New-Earth" Superman (Kal-El). In issue #6 of the Infinite Crisis mini-series, a now anti-heroic Superboy-Prime convinced Alexander Luthor that Earth-Prime was the ideal world and urged him to draw his inspiration for making a new Earth from Earth-Prime. Luthor began searching through the myriad Earths for Earth-Prime and, in a metatextual nod to Earth Prime's original status as the keystone Earth, looks directly at the readers and reaches out towards them to grab our reality. In 2004, DC revisited the Earth-Prime concept in the miniseries Superman: Secret Identity. Writer Kurt Busiek states in the introduction to the collected volume of the series that the original appearance of Superboy-Prime was the inspiration for his graphic novel. Legion of Super-Heroes The 2008 Final Crisis tie-in series Legion of Three Worlds makes various references to Earth-Prime during a time that Superboy-Prime is still looking to make his "Perfect Earth". He starts by rebuilding the Legion of Super-Villains to fight Superman and the three versions of the Legion of Super-Heroes. During the battle, the 2004 team's Element Lad creates Kryptonite that unexpectedly affected Superboy-Prime; the Kryptonite of New Earth had previously had no effect on Superman (Kal-L) and or Superboy-Prime during Infinite Crisis. At the end of the mini series, it's revealed that Earth-Prime has been reborn and that Superboy-Prime was returned there. It was also revealed that the Threeboot Legion are from Earth-Prime's future. After the events of Flashpoint Superboy-Prime was not seen again until