Apocalyptic fiction is a sub-genre of science fiction that is concerned with the end of civilization either through nuclear war, plague, or some other general disaster. Post-apocalyptic fiction is set in a world or civilization after such a disaster. The time frame may be immediately after the catastrophe, focusing on the travails or psychology of survivors, or considerably later, often including the theme that the existence of pre-catastrophe civilization has been forgotten (or mythologized). –Wikipedia You start with one Main Character who has either lost everyone and everything they care about, or who soon will lose everyone and everything they…