
Justin embraces mortality to live with his family; his new challenge arises when Alex introduces Billie, a wizard-in-training, seeking Justin's mentorship.
When Justin forbids Billie from having a haunted house, she takes Justin to Halloween future, present and past in an attempt to help him rediscover his Halloween spirit.
When Billie's magic starts fizzling, she and Milo go to the wizard world for a cure; the family learns the true cause of her wonky magic: a power-draining Changeling!