<P> In the 1986 TV movie, Mildred was played by Return to Oz star Fairuza Balk . It aired on both Central Independent Television and HBO . </P> <P> In the 1998 ITV TV series, Mildred was played by Georgina Sherrington . She was also played by Sherrington in Weirdsister College . Mildred made a brief appearance at the beginning of the first episode of The New Worst Witch as a successful witch escorting her equally clumsy cousin Henrietta "Hettie" Hubble (played by Alice Connor), to Cackle's Academy . </P> <P> In the 2017 BBC TV series, Mildred is portrayed by Bella Ramsey, who played Lyanna Mormont in Game of Thrones . This adaptation places great emphasis on the idea that Mildred is the first person in her family to manifest magic, thus attributing most of her problems at school to the fact that she has far more to catch up on compared to classmates who have been schooled in the rules of magic for years . It is revealed in the season two finale that actually Mildred's ancestors were magic, but her great - grandmother thirteen generations back sacrificed twelve generations of magic to reignite a founding stone . </P>

Where does mildred hubble get her powers from
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