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Along with Superman and Lois Lane of Earth-2 and Alexander Luthor of Earth-3, Superboy Prime was sequestered in a pocket dimension at the end of that first Crisis, as DC Comics’ multiple dimensions collapsed into one. Years later, they escaped that dimension in Infinite Crisis, which is when things went bad. Under the manipulation of Alexander Luthor, Prime turned evil, killed the mainstream continuity’s Superboy, and nearly wrecked the entire multiverse.