In the episode, Hanna is attacked by a dog, which was given werewolf-like qualities by villain Zanrelot. Later at night, Hanna sent Milli off to bed, and quickly noticed some hair covering the bitemark on her leg. When the full moon arose in the night sky, Hanna turned heel and transformed into a werewolf, and she prowled in the darkness; hovering around a flock of sheep before devouring one of them. The Guardians noticed Hanna acting strangely the following morning, as she is also shown with leaves in her hair as she entered.
Later that night, the evil Hanna transformed into a werewolf once again and devoured another sheep. After her latest attack, the villainess returned home and went to her bedroom, unaware that Milli had seen her, and got back into bed. It was there that Milli opened the door and learned that her mother was the werewolf, as Hanna continuously snarled while she was laying asleep. The Guardians learned about the werewolf curse and teamed up to save Hanna, as the third night could end up with Hanna being a werewolf forever. Hanna again shifted into her heel werewolf persona on the following night, and came face-to-face with the group, who fired their water cannons at her to subdue her temporarily. Hanna continued her attempt to attack the group, which prompted Milli to attempt to get through to her mother. Her attempt was successful, as Hanna's love combated against the werewolf curse, and she was freed from the curse for good.