Shadow Star son of Twilight Spakle and Dark Fang, arrives in ponyville when Twilight and the others are facing nightmare moon, when he was walking he found Apple Bloom, Sweet bell, Scootalo and Moon light in the Everfree forest, when they start to walk away of the trail end up finding a temple, where they release a nightmare sealed by Princess Luna, now under the supervision of the princess of the night they hunt the nightmares behind the reality