The Legend of Caliban (Part 1) "Fall from Grace"

One thousand years ago the Arcadian race had come to Earth from the outer reaches of the galaxy. Their sun was dying, and so too would planet Arcadia. Knowing this, over the course of time they built great skyships able to traverse the darkest reaches of the universe, planet Earth merely having been chosen as a stopping point on the path to a longer journey; an uninhabited planet charted long ago that could support Arcadian life and thus enable them to start anew. Yet during the Arcadians’ journey through the stars, they arrived only to find Earth completely devastated and nearly devoid of life. And so, finding themselves stranded and unable to resupply their vessels, they had little choice other than to remain. Gradually, the humans below who survived slowly began to regain a foothold and reestablished their civilization, yet it resembled nothing as it once had. Believing those above living in their cities in the skies must be Gods, the humans worshipped them and gave penance for the sins committed by those who had come before.