Mildred finds that not all of the witches in town are from the academy, some evil ones have shown up and are planning to take over the academy by turning everyone into frogs whilst they're asleep! They discover her and they cast a spell on her making her unable to move. When they're gone, Miss Drill comes to help her. Back at the academy, with some help from Maud, Mildred foils the evil witches' plans, and gives them that shrinking feeling.... It turns out that their leader is none other than Miss Cackle's twin sister, Agatha....
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