An earthquake drops Dorothy and her friend Zeb into the Vegetable Kingdom, a land of glass buildings, princesses that grow, and invisible people, where they encounter the Wizard of Oz and together seek the Emerald City.

When Princess Ozma and all the magic of the Land of Oz are mysteriously stolen away, Dorothy and the other residents of Oz are determined to find their missing ruler and the thief responsible for her disappearance.

Six tales present further the adventures of Dorothy and Toto, Ozma, Tiktok, Jack Pumpkinhead, the Tin Woodman, and other characters from the land of Oz.

Dorothy tries to rescue the Tin Woodman and Scarecrow from the giantess who has changed them into a tin owl and a teddy bear and is using them for playthings.