A dalek appears in Equestria - not just any dalek, but the one that had been corrupted by Rose Tyler's DNA. It has a choice of life as a pony, or dying, and finds that it cannot bear to die a second time. Thus begins a strange adventure...
After his older sister's death, an aspiring 15-year-old cartoonist runs away from home, wishing for a better chance at life. A cyclone sends him to the most unlikeliest of all places: Equestria!
The Doctor and Derpy find themselves in a dark story coming true around them and have a single night to save the author and Equestria from the evil that's taken root inside both.