When shady circus magician Oscar Diggs is hurled away from Kansas into the wonderful land of Oz, he thinks that fame and fortune are his for the taking. However, three witches -- Theodora, Evanora and Glinda -- remain unconvinced that Oscar is the great wizard that the inhabitants of Oz need and expect. Reluctantly drawn into Oz's epic problems, Oscar must find out who is good and who is evil before it's too late.