Jeanette, you are probably having in mind some real world post-apocalyptic RPG we don't know about? Or what is that about?
Five years ago someone, by the screen name The Nobody, started a post-apocalyptic RPG. He did not have the drive to see it through so it died.
Having the drive and the permission, I rebooted the RPG. The Nobody never revealed the story to me so I had to come up with one of my own. I had help from an online friend I have known since I was a teen. Despite the fact my online friend helped to create a new plot, we constantly fought over it once the RPG began and it got locked.
The reboot was a combination of The Setting and Rules that The Nobody established, a bit of fantasy to drive the story and what I had researched then.
Jeanette Isabelle