From DC Database
Post-Zero Hour is the possible future in which the second incarnation of the Legion of Super-Heroes takes place. When the original Legion was wiped out during Zero Hour, the 30th Century was completely rebooted. This possible future lasted for 10 years, until it was destroyed by time rifts created by the Persuader's Atomic Axe breaching multiple realities. This led way to a third incarnation of the Legion. When Alexander Luthor manipulated the Multiverse during Infinite Crisis, the Post-Zero Hour future appeared as the alternate Earth-247. During Final Crisis, its Legion has reappeared once again to team up with both other Legion incarnations and Superman against Superboy-Prime and his Legion of Super-Villains.
- Legends of the Dead Earth and DC One Million, other possible futures of the DC Universe, are both functions of the Post-Zero Hour future.
- The end of JSA #22 seems to indicate Earth-22 could be the reality known before as Earth-247, as the Legion featured in the final panel looks like the one on Legion of Three Worlds, and the destruction seen in one of the last panels could refer to Legends of the Dead Earth.
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