After disaster strikes in the future, four ponies, Starlight Glimmer, daughter of Sunset Shimmer and Twilight Sparkle, Sunburst, son of Celestia, Trixie Lulamoon, daughter of Luna, and Flurry Heart, daughter of Cadance and Shining Armor, must go back in time to prevent a great evil from arising.
However, they must tread lightly, for they know not what paradoxes they could cause with this new time travel spell. Will they be able to defeat whatever evil they came back to stop? Or will they be erased from existence forever?

This story takes place after Rainbow Rocks, none of the other movies/episodes after this are canon in this universe.