Jonah, persuaded by a friend, takes part, on board of a spacecraft, in a the first voyage to a planet suddenly appeared in the sky around the Earth. Left alone up there, he receives from God the task of going back to Earth, that in the meantime has been ravaged by a nuclear war, to convince the surviving men to move quickly to the new planet. Once he has fulfilled his mission, he remains alone on Earth, awaiting his final destiny.