Bonnie Cassidy was part of a family of hunters, which included her brothers, Vance and Travis, and was led by their father, Faron. The group was tracking an ancient demon, which later killed both Vance and Travis, leaving Bonnie and Faron on their own. It was revealed in the episode that Bonnie had been kidnapped by a demonic cult and rescued by her family. Bonnie and Faron reached Curious Goods for safety, but the demon followed them and eventually encountered Bonnie while she was upstairs.
Reveal & DeathEditHowever, Bonnie turned heel and showed the demon a distinct mark on her person, while flashing an evil smile on her face and revealing herself as the culprit who summoned the demon and kept it under her control. In order to continue covering her tracks, the evil Bonnie demanded that Faron kill Micki, Jack, and Johnny; falsely claiming that they're in league with the demon. After failing to manipulate Faron into killing the trio, Bonnie revealed her heel persona and boldly confessed to everything, stating that she wasn't kidnapped and she summoned the demon herself.
The villainess provided distractions that led to the demon killing her brothers, and she opened the vault to summon the demon in, but she was stopped by her father, who killed her with a cursed dagger. Because Bonnie was connected to the demon, her death destroyed the demon as well.