The Emerald City of Oz

Uncle Henry and Aunt Em face financial difficulties. Conveniently, Dorothy happens to be a Princess of Oz where she is more than welcome to visit, so she wishes them all into Oz with the use of Ozma's Magic Belt. Meanwhile Roquat, the King of Nomes, is gathering an army and digging a tunnel to the Emerald City to seek vengeance and reclaim his Magic Belt.