While trying to help Frankie Stein learn more about her freakycool scaritage, the fashionably ghoulfriends traveling back in time to the very first day of Killer High! Additionally, they meet Sparky, a teen having an obsession . However, when the ghouls are followed by Sparky through a killer period portal to Monster High, the event ends in eight of them fusing together into four hybrid Monsters that are creeperiffic. Now, they have to work together to restrain their own bodies at the Bitecentennial Play by destroying perfect Monster High and stop one of Sparky's experiments!