When Sabrina inadvertently complains about her Quizmaster's teaching methods to a woman who turns out to be his boss, the Witches' Council rules that he be reassigned to a new pupil, the obnoxious Ralph. Sabrina, who is in the midst of cramming for her hardest magic test to date, finds herself being taught at home by her less-than-scholarly Aunt Hilda, while Zelda substitutes for her chemistry teacher at school.

When Sabrina plays one aunt against the other they decide to setup separate households and Sabrina has to decide between them.