Reality names were reused several times. See also Earth 21.
Earth-21 is one of fifty-one divergent realities that branched from the core New Earth reality during the recreation of the Multiverse shortly following the events of Infinite Crisis. In this universe, the Cold War ended peacefully in the 1960s as a new age of heroes begins in this era.
- Originally the reality unnamed of the DC: The New Frontier (Volume 1), it was revealed as alternate reality in the 52 Multiverse in Countdown: Arena #1. The Essential Wonder Woman Encyclopedia identifies the Pre-Infinite Crisis version of this reality as Earth-260.
- Characters from Earth-21
- Other things related to Earth-21
- Earth-21's Comic Appearances
- Reality Gallery: Earth-21
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