The running of the leaves is a national tradition in Equestria, and Ditzellia Esmerelda Doo, AKA Derpy Hooves, is as per usual, running in last.

But when she's suddenly transported to Earth during the Kentucky Derby in the 1940s, things become very different for her. Now, stuck on earth, and with no way to get home, what harm could there be in being the only winged equine in professional racing?