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Everyone always does a story where someone from the DC universe is in the Marvel universe so I thought why not flip the script.

Takes place after the events of Enemy Below part two in the Original Justice League animated show. On their way back to Atlantis with Arthur. Superman picks up a heartbeat that wasn't anyone of the league or the atlantians. He breaks away to find the source of the heartbeat only to find one of the First Heroes frozen in the ice- Captain America.