Short summary of Giant Horse of Oz story:
Many years ago, before Dorothy came to Oz, the royal family of the Munchkins were kidnapped and imprisoned on the mysterious Ozure Islands by the witch Mombi. Quiberon, an evil monster created by Mombi, guards them, but now wants a mortal maiden. Prince Philador of the Ozure Islands sets out to save them, and meets Tattypoo, the Good Witch of the North (not seen since a cameo in The Road to Oz).
