Five years have passed since the ponies of Ponyville fled their home in Equestria from a puzzling apocalyptic event. A plush tropical island discovered by Twilight Sparkle has been their refuge, but leaving Equestria only created more questions than answers. Luster Dawn is determined to find out what is really happening back home, as well as on this mysterious island. But, with a bit of help, she may just discover something even more disturbing than the idea of never going home.