As a follow-up to The Worst Witch serial, we follow Mildred Hubble (Georgina Sherrington) in her first year at Weirdsister College, a university for students of magic. Similar to her adventures at Cackle's, Mildred usually messes up, but saves the day in the end. The series has a darker side than The Worst Witch, with evil creatures and a possible doomsday.