Devon discovers his people live on a huge spacecraft and is sentenced to death for heresy when he states this. He escapes, and his betrothed Rachel and friend Garth follow him on his journey.

Devon, Rachel and Garth are exploring one of earthship Ark's huge freight chambers. Pushing past loud radiation warnings, they are suddenly lifted to the surface of the dome Omicron and find themselves in a strange city of geodisic domes and angular buildings.

A siren sounds as the trio is bathed in a hot, blinding light and surrounded by soldiers demanding identification. But the moment they see Rachel, they drop reverently to their knees and hail her as the goddess Calabra.

The dumbfounded visitors are escorted to a palatial building where the Governor interrogates them as an awed court watches. Rachel's attempts to explain her origin are in vain, for the Governor indicates a portrait of the goddess Calabra who bears an extraordinary resemblance to Rachel and orders that arrangements be made at once for their wedding.