Draculaura has a fright idea when her dad lectures her class on human holidays! She convinces the Monster High students that it's time for their own holiday - a Howliday! But, the students have different, competing ideas for the howliday, causing chaos. Now the ghouls must use their abilities to unite the students with the message: Holidays are about family and togetherness.

While attempting to help Frankie Stein learn more about her freakycool 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 bodies in the big Bitecentennial Play and stop one of Sparky's experiments from destroying imperfectly perfect Monster High!

It's fright lights, big city when the Monster High ghouls head to Boo York! Cleo de Nile is invited to attend a gancy gala celebrating the return of the magical comet and, of course, she brings along her beast friends. But their trip isn't all fun and frightseeing because Nefera, Cleo's sister, uses the comet's power for her own spooktacularly sneaky plans. Can the monsters unwrap the mystery of the comet in time to stop Nefera? Find out in Booy York, Boo York, the first-ever Monster High musical, featuring eight original songs.