DVD cover for Season Five of Are You Afraid of the Dark?
The unnamed Shopkeeper is an unseen villainess mentioned in "The Tale of the Vacant Lot," episode 5.11 of Are You Afraid of the Dark? (airdate January 20, 1996).
The nameless shopkeeper was a woman with a connection to Marie, the episode's main villainess, as she was the owner of an outdoor store that Marie frequently visited when she was a teenager. Marie was unhappy with her life, and the shopkeeper--sensing this--offered Marie anything she wanted, while only opting to take what had no value to Marie. With every visit, Marie's life improved, but her face and hands became disfigured and covered with lesions.
Afterwards, the evil shopkeeper revealed that she had taken all of Marie's love from her, with Marie not recognizing what the villainess had done to her until it was too late. The sinister shopkeeper's fate was never revealed, and in the episode's events, Marie turned heel and resorted to targeting main protagonist Catherine Crawley in a villainous quest to regain her beauty.