Twilight and her friends are ready for a fun, festive Halloween party at Canterlot High. With the seven prepared in-costume and the school in full decoration, it's bound to be a night to remember.

Unfortunately it seems that someone with Equestrian magic is afoot, and intends to make sure that tonight's party-goers REALLY get into character! Can the Humane Seven get to the bottom of this magical mayhem and put things right?