Glinda of Oz

Princess Ozma and Dorothy travel to an obscure corner of the Land of Oz, in order to prevent a war between two local powers, the Skeezers and the Flatheads. The leaders of the two tribes prove obstinate. Unable to prevent the war, Dorothy and Ozma find themselves imprisoned on the Skeezers' glass-covered island, which has been magically submerged to the bottom of its lake.