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Earth-21 is one of the many universes in the multiverse.

History

Earth-21 was depicted on a map shown to Barry Allen of Earth-1 by Jay Garrick of Earth-3.[1]

Appearances

The Flash

Season 6

Behind the scenes

  • In the DC comics, Earth-21 is a universe in which the Cold War ended peacefully in the 1960s.

References

  1. "A Flash of the Lightning"
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