No clue how I missed this in my period where I was watching every post-apocalyptic film I could get my hands on, but here it is, one of the first versions of the story that I’ve run into. Released in 1960, it’s a full 25 years before “The Quiet Earth” which has the same conceit of “what happens when you’re the last person on earth, find out there’s a woman, then find out there’s another man?” The details are all different, but I believe this is the earliest example of this type of story.
It’s not bad either, Betsy Jones-Moreland is downright captivating as the ‘kept’ woman of a super rich guy always in trouble with the local politicians and the dynamic between the two male leads is believable and entertaining.