It's Halloween and Sunset Shimmer and the others are looking forward to having a good time. However, when Twilight offers to make their costumes look more realistic, they get more than they bargain for when they actually transform into their costumes! Now, Sunset is the most brilliant unicorn wizard in existence, Rarity and Applejack have switched perspectives, Pinkie has become psychotic (in a bad way), Fluttershy and Rainbow Dash are sporting fangs and fur, and Twilight must keep her alter-ego from reasserting itself! Can Sunset and Twilight reverse the spell before midnight when the spell becomes permanent and they all remain trapped in their altered forms forever?

My entry in the FlutterDash Contest: Nightmare Night, What A Fright!

Now has a TVTropes page.