David Randall is a carefree ladies man and skilled pilot who finds he has been let in on the greatest and most terrible secret in the world when he is paid to deliver some mysterious pictures from one eminent astronomer to another. The recipient, Dr. Hendron, confirms the awful findings of the sender: the planet Zyra will collide with Earth and wipe out all of humanity. Despite widespread disbelief, two philanthropists give Dr. Hendron some of the money he needs to build a rocket ship that will, at least theoretically, take them to Zyra, which may or may not be habitable for humans. The rest of the money comes from Sydney Stanton, a wheelchair-bound old man, who insists he come along, despite the severe limitations on the number of passengers and amount of cargo. Meanwhile, as doomsday approaches, Randall is surprised to find himself in a love triangle with Dr. Hendron’s daughter and her fiancé. Humanity is in peril, and only a modern-day Noah’s ark, and the continued need of a man.