Nightmare Night has an origin as old as Nightmare Moon itself. Few that know of the holiday for its frightful ways that foals love could see more value in it.

In a time of great challenge, Princess Celestia is not eager to change herself even as everything else around her becomes unrecognizable.

There can only be one ruler of Equestria and Nightmare is determined to take Celestia's place. Nightmare Moon was beaten but the conflict is not yet over.