When walking through the forests near the academy, Mildred hears voices through the trees and comes across a group of witches, headed by one who looks like Miss Cackle. After hearing their plot to turn every teacher and student witch in the academy into frogs, Mildred turns the group into snails, packs them into cardboard boxes and takes them back to the academy. At first, Miss Cackle and Miss Hardbroom refuse to believe her, but when Mildred describes the leader, Miss Cackle realises she sounds like her identical twin sister, Agatha. They turn Agatha and the rest of the group back into humans, Mildred's interview is cancelled, and she is praised as a hero to the rest of the academy.