As Princess Twilight Sparkle and her friends - Spike the Dragon, Pinkie Pie, Applejack, Rainbow Dash, Rarity, and Fluttershy (including Starlight Glimmer and the Great and Powerful Trixie) to Nightmare Night in Ponyville, Sunset Shimmer comes and invites Twilight, Starlight, and Spike to go to the human world for Halloween (the human version of Nightmare Night). As they go to their the Crystal Mirror, Sunset, Twilight, Starlight turn back into humans, Spike turns into a puppy, they reunite their human friends from Canterlot High (except for Twilight’s human counterpart, Sci-Twi, who is away on holiday). The Girls felt ready to do some tricks, but they didn’t think costumes were scary enough anymore. The Girls felt that ordinary Halloween costumes might not be convincing enough. So, they get a special visit from an old friend of Fluttershy: Sarah Scientist. Sarah made a machine resembling a sterilization chamber that can transform any human into any specific creature. She was going to turn the Girls into REAL monsters - for REAL. As they head into the chamber, Twilight and the Girls (except Spike, who watches with Sarah) actually get turn into REAL monsters.

Twilight Sparkle: a witch
Sunset Shimmer: a swamp creature
Fluttershy: a ghost
Pinkie Pie: a werewolf
Rarity: a mummy
Rainbow Dash: a vampire
Applejack: a Frankenstein monster
Starlight Glimmer: an alien
Trixie Lulamoon: a dinosaur

Crossover of My Little Pony: Friendship is Magic/Equestria Girls, Scooby-Doo! and the Ghoul School (Grimwood Girls), and OK K.O.! Let's Be Heroes! (Enid only)

Written by TylerAJohnson352