Back to school's never been so cool or supernatural for Marnie (Kimberly J. Brown), her grandmother Aggie (Debbie Reynolds) and her family of witches in this latest chapter in the ever-popular series of Halloween town movies. When Marnie convinces the Halloween town Council to send several teenagers to her high school in the mortal world, she even promises to give up her magic if any harm comes to them. But soon, Marnie and her new friends are in trouble and out of luck when the evil Knight of the Iron Dagger appears. 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.