Itʼs the night before Halloween, and all the goblins and ghouls of Grimmsburgh are thrilled beyond belief... but, wait! Itʼs really April the 1st - April Foolʼs Day - and Selma the Wicked Witch has cast an evil spell on the land, convincing everyone in town that itʼs time to trick-or-treat! And not only that, but if the townsfolk donʼt snap out of it by midnight, the spell will become permanent and every day will be Halloween... forever! But when two fearless local monsters, Larry the Zombie and Fred the Mummy, realize something strange is going on, they recruit their number one jack oʼlantern, Bighead, and set out to break Selmaʼs magic spell and save the holiday!