Dorothy is a young orphaned girl raised by her Uncle Henry and Aunt Em in the bleak landscape of a Kansas farm. She has a little black dog Toto, who is her sole source of happiness on the dry, gray prairies. One day the farmhouse, with Dorothy and Toto inside, is caught up in a cyclone and deposited in a field in Munchkin Country, the eastern quadrant of the Land of Oz. The falling house kills the evil ruler of the Munchkins, the Wicked Witch of the East.
The Good Witch of the North comes with the Munchkins to greet Dorothy and gives Dorothy the magical shoes that the Wicked Witch had been wearing when she was killed. In order to return to Kansas, the Good Witch of the North tells Dorothy that she will have to go to the Emerald City and ask the Wizard of Oz to help her.
On her way down the road of yellow bricks, Dorothy frees the Scarecrow from the pole he is hanging on, restores the movements of the rusted Tin Woodman with an oil can, and encourages them and the Cowardly Lion to journey with her and Toto to the Emerald City. The Scarecrow wants to get a brain, the Tin Woodman a heart, and the Cowardly Lion, courage. All four of the travelers believe that the Wizard can solve their troubles. The party finds many adventures on their journey together, including overcoming obstacles such as narrow pieces of the yellow brick road, vicious Kalidahs, a river, and the Deadly Poppies.