Kamandi, the Last Boy on Earth (1972) #29

"Mighty One" – (20-page story) – Kamandi and Ben Boxer find a tribe of apes who explain that an ancient hero whom they call Mighty One constructed the new continent between Europe and America to cap volcanoes, and they believe Ben may be the Mighty One returned.

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NOTE: This story makes Kamandi a part of the pre-Crisis DC Universe.

NOTE: Supeman once traveled to Earth-AD's past wherein he lost his costume for a brief time. Although he eventually returned to retrieve it (in Superman #295}, his presence left a permanent legacy upon the planet.