Marnie lives in two worlds and she wants to prove that humans and the supernatural inhabitants of Halloweentown can peacefully co-exist. But Marnie's idea to sponsor an exchange program between Halloweentown High and her own high school quickly turns into a battle to save her magical powers and keep the portal between worlds open. Everything goes wrong when a Knight of the Iron Dagger starts haunting the Halloweentown exchange students right in the mortal world. He's determined to destroy all things magical, and it's up to Marnie to save her high school, the human world, and her magic.
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