The Doctor, after 25 regenerations, wishes for a place to call home for his final one. The Tardis goes crazy, throwing his regenerating body around before landing in a mysterious land where he, and most creatures, are talking equines. Derpy tries to calm her nerves as she goes through her first day as a mail mare. When the Doctor meets Derpy, a string of events unfurl, thrusting the unlikely pair into space and time. With the doctor's lack of knowledge in all things Pony and Derpy's clumsy nature, how will the two fair in the wide world of Equestria?