Captain Groad appraoches the earth in his spaceship. Coming from an advanced civilisation, he is appalled at how primitive the inhabitants are. Why not try some improvements? He decides to cross-breed with them, and selects a woman - Mary - to be fertilised. The name of the child: Jesus.

Groad has great schemes for the planet's inhabitants. His son, Jesus, is to be the prototype for an improved race of humanity, but Deablo, who has been allowed onto the spaceship, has other ideas. And Groad is defying the Interstellar Council's ban on contact with the planet. How will they react when they find out?

This dramatic tale deals with fascinating and profound questions about the nature of religious belief.