Chorus, Prose, and Ginger Blush unwillingly embark on a journey through a frontier they never expected to encounter. The conclusion to the stories begun in "One-Horse Town: A My Little Pony Story" and "Dark Horse: A My Little Pony Story"

The sequel to One Horse Town: A My Little Pony Story! Dark Horse follows Chorus, Prose, and Ginger Blush as they adventure outside of Ponyville to discover that their help may be needed once again.

Ponyville is under a secret siege. Can three seemingly unimportant ponies stop it?