During Halloween, monsters are warned that humans may try to hunt them, so they will need to stay calm for a few days. But when a Monster High skull appears painted on the human high school, the questions start. Holt Hyde is accused of painting it, but he claims that he did not do it. In order to solve this, both monsters and humans decide to join and start a search together for finding the real meaning of Halloween. Monsters want to make clear that they did not want that Monster High skull to claim that they think Ghouls Rule and that human are less than them, and humans want to figure out what does really Halloween mean to both parts!
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