Prequel Oz is a term that can describe Oz books and films that take place before the timeline of The Wonderful Wizard of Oz. They tend to be mostly origin stories about the good and bad Witches along with the Wizard. They tend to have elements that also allow them to fit in the category of alternate Oz, but for the most part, they try to be consistant with L. Frank Baum's version of Oz.

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Also in the Magic Land series, there is a prequel novel called Goodwin the Great and Terrible written by Sergei Sukhinov.