The Wizard of Oz was originally a screen play, then became several incarnations of films. The best known is the 1939 adaptation by Metro-Goldwin-Meyer. The story is about Dorothy and Toto (the dog), who land in the land of Oz and seek to return home. They must venture on the yellow brick road to The Wizard, and along the way meet The Scarecrow, The Tin Woodsman, and the Cowardly Lion. They also must stop the Wicked Witch and her minions.
The Wizard of Oz is mentioned several times in The Dark Tower Series and is the main basis for the ending of Wizard and Glass. Much like Dorothy, the ka-tet was blown to a world where magic and wizards are real. Randall Flagg also poses as The Great and Terrible Oz in a recreation of the movie's Emerald Castle.