The World, the Flesh and the Devil is a 1959 American science fiction doomsday film written and directed by Ranald MacDougall. The film stars Harry Belafonte, who was then at the peak of his film career. The film is set in a post-apocalyptic world with very few human survivors. It is based on two sources: the novel The Purple Cloud by M. P. Shiel and the story "End of the World" by Ferdinand Reyher.

References:
https://en.wikipedia.org/wiki/The_World_the_Flesh_and_the_Devil_(1959_film)