The Worst Witch (1998 TV series)
The Worst Witch is a British-Canadian ITV television series about a group of young witches at a school for magic. The series stars Georgina Sherrington and Felicity Jones, and is based on "The Worst Witch" books by Jill Murphy (published from 1974 onwards). It aired for a total of 40 episodes spread over three series between 1998 and 2001, before being followed by "Weirdsister College." Most episodes revolved around the school, following the adventures of Mildred and her friends. The series was later followed by "The New Worst Witch", which ran for two series and chronicled the experiences of Mildred's younger cousin Hettie as she attended the school.
The Witches of Karres
"The Witches of Karres" was originally a novelette published in the December 1949 issue of "Astounding Science Fiction", and has been reprinted many times. The novelette version was included in "The Science Fiction Hall of Fame, Volume Two" as one of the best works published prior to 1966. Schmitz expanded the novelette into a novel in 1966, and it was reissued by Baen Books in 2005.