At the beginning of the show we find Mildred telling everyone how Miss Hardbroom changes people into frogs and that there is a girl in the pond that HB changed into a frog. Later Mildred gets into another fight with Ethel. Ethel takes revenge on her by turning her into a frog. HB finds frog-Mildred and carries her around in her purse for a while and then puts her in a jar during potions class. Mildred escapes and gets out to the pond. She meets the frog in the pond who actually turns out to be a wizard turned into a frog by a rival wizard. She promises to get him turned back. Mildred's friends find her and get Ethel to turn her back and then Mildred has to convince HB that she was actually a frog. Both Mildred and Ethel are told they are not allowed to go to the upcoming wizard's class.
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Ready to Watch The Worst Witch, Season 2, Episode 3?