In need of restocking supplies, alien explorers enter into orbit over a vibrant, newly charted planet. On it they discover many diverse cultures, rich with tradition, and steeped in violence. Living within in this paradoxical mix is a man called Jesus: a being who will change the aliens' lives forever. Horrified by the impending crucifixion and the convoluted politics of ancient Rome, the aliens decide to intervene. But each action they take to help seems to draw them relentlessly closer to a date with destiny, and a modern world bent on nuclear extinction.