The horny farmer McDonald has his wicked way with a goat. Life returns to normal for the family, until the goat gives birth! The mutant off spring, called Billy, is tormented by the Farmer's sons, only the daughter feels any pity for him. It isn't long before Billy, who keeps growing bigger, plans revenge..

Portrays the conversion to Christianity of a young Zealot, Joel, and the Roman soldier Longinus through the teachings of Jesus in his Parable of the Good Samaritan.