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.
- Assumed as an alternate reality in Countdown: Arena #1.
- It is one of the alternate realities of the post-Infinite Crisis Multiverse. It is home to the DC: The New Frontier miniseries.
- Referred to by Dan Didio in DC Nation #77.
- The Essential Wonder Woman Encyclopedia (2010) identifies the Pre-Crisis version of this reality Earth-260 though given it is a hypertime reality it could just as well be same reality.
- Characters from Earth-21
- Other things related to Earth-21
- Earth-21's Comic Appearances
- Reality Gallery: Earth-21
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