For years, students at Monster High were warned that Halloween was a night to stay inside and avoid conflict at all costs. Monster High: Ghouls Rule movie But Frankie and her friends discover that ghouls and "Normies" once loved to spend the holiday together. Monster High: Ghouls Rule video The ghouls decide to turn back the clock and use the night to celebrate their individuality and show that it's okay to "Be Yourself.