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Rebecca's been rejected by her girlfriends, so when a 300-year-old magical toad offers to become her best friend things take a turn for the better. Instead of lipstick and little ponies Sarah becomes absorbed by learning to fly and casting spells on her horrid neighbour and beastly girlfriend. It all sounds great fun but having magical powers brings serious responsibilities when Glubbslyme encourages her to be as bad as her 17th century namesake, the wicked witch Rebecca Cockgoldde.