In an alternate Equestria, the events of Discord's return play out very differently and lead to a desperate letter from Twilight Sparkle to Princess Celestia; however, Twilight's spell to ensure the delivery of her message unintentionally transcends time and space, and travels to our Equestria during our Twilight's mission to the Crystal Empire. With Celestia's protegé already occupied with matters of great importance, it is up to Luna's far younger student to venture into an alternate Equestria and attempt to guide seemingly familiar ponies to a brighter future.