Just as a fyi, this story is right after season 5 episode 1-2. So in short, the princesses go to Earth to find a hero, all they saw was zombies and dead things, nothing alive until he saves their lives.
He goes to Equestria to battle King Sombra and the army of the dead. And maybe even find love, find out here!
If you like this story please check out some of my other stories.