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Also known as 'Earth-A', Earth-721 is home to a Reed Richards that became the rocky Thing and a Ben Grimm that became the stretchy, flammable Mr. Fantastic. It was briefly visited by the Thing of Earth-616[1], and became involved in a scheme by Arkon to pit three worlds against each other in nuclear wars.[2] Despite the presence of a Thing and a Mr. Fantastic, almost no natives of Earth-721 have any superpowers. A scientist from Earth-A created a device that would allow his fellow Earth-721 inhabitants to travel to Earth-616 and transform into their superpowered counterparts, complete with all their powers and paraphernalia. Once this clandestine replacement of Earth-616's superhumans was discovered, the Reed Richards from both universes quickly set to work, sending both abductors and abductees back to their home universes, before destroying the dimension-crossing device.

  • There's an alternate version of Earth-A, Its name is Earth-9532, which was possibly destroyed by Vangaard.