Ever heard of a Nightmare? A vicious and fiery creature said to be originating from the underworld? In a rare case a pony is able to transform to their Nightmare form. The pony who was able to do that got himself banished to an enormous area guarded with the strongest magical barrier ever to be created in Equestria. This area is called 'The deeper parts of Equestria'. The nightmare who was banished there had his mission to learn how to control his great power and to bend it to his will.

After so much as 20 years the pony achieved enough control to break free from the prison known otherwise as 'The deeper parts'. But he returns with bad news, soon a war will commence between Canterlot and a mind controlling creature called Soulbel! The pony needs to raise an army in order to fight this war. Therefore he befriends the elements of harmony currently known as, Twilight, Rarity, Fluttershy, Rainbow Dash, Applejack and Pinkie Pie. Will they be able to fight off this menace? Or will they become the mindless slaves of Soulbel...