Based on Gregory Maguire’s amazing novel of the same name, the show explores the early lives of Glinda (the so-called Good Witch of the North) and Elphaba (the alleged Wicked Witch of the West) from The Wizard of Oz lore … long before Dorothy Gale blew in from Kansas, came crashing down in Munchkinland and sported those infamous sparkling slippers while trotting down the Yellow Brick Road.