A portal has been opened between the human world and Halloweentown and Marnie (Kimberly J. Brown) sets up an exchange program to bring a group of Halloweentown students to attend her human high school. When she inadvertently bets the Cromwell magic that no harm will come to the students, strange things start happening! Marnie and her family must get to the bottom of things and protect the students from the legendary Knights of the Iron Dagger - and save their own powers.
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