In the Second World, Equestria is took over by the Nightmare Mane 6 (the Second Trilogy's Main Antagonist), so then Princess Celestia decide to free Moonbeam (The Trilogy's Main Protagonist) to freedom but first... Cadence offer Him to defeat the Nightmare Mane 6 to order to free equestria from destruction. So Now, Moonbeam teaming up with the Cutie Mark Crusaders on an Horror Adventure to save Equestria from the Nightmare Mane 6.