While attempting to help Frankie Stein learn more about her freaky cool scaritage, the fashionably fierce ghoulfriends travel back in time to the first day ever of Monster High! There, they meet Sparky, a skullastic teen with an obsession for creating life. But when Sparky follows the ghouls through a killer time portal to modern-day Monster High, the event results in eight of them fusing together into four creeperiffic hybrid Monsters. Now, they'll really have to work together to control their...

When Spectra Vondergeist goes back to her old ghost school to find out why Monster High is being haunted, the other ghouls use Boogey Sand to transform into ghosts so they can follow her. There, they die-scover that spirits are low because the Principal weighs students down with ghastly rules and detention chains. It's up to the ghouls and their new ghost friends to unbury the mystery of the hauntings and the secrets of the ghost school!