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- The first series in a trilogy set in a bleak, alternate Marvel Universe where everything that still lived had been mutated by Terrigen Mists (Earth-9997)
- Introduces many characters with similarities to heroes in the Earth-616 Universe
- Prelude issue #0 provided an overview of Earth X prior to the release of the Terrigen Mists
- 1st full and cover appearance of Thor as a female, alternate reality of Earth X
- Inspired by Jane Foster who became Thordis from What If...? #10, but the character on the cover is this reality's Thor Odinson