Out of Oz borrows heavily from the second Oz novel by Baum where the Emerald City 's power is overthrown by a General Jinjur and her all - female army accompanied by a witch named Mombi .
The second Oz novel by Baum is the Marvelous Land of Oz .
Out of Oz borrows heavily from the second Oz novel by Baum , The Marvelous Land of Oz , where the Emerald City 's power is overthrown by a General Jinjur and her all - female army accompanied by a witch named Mombi .