A mysterious thief has stolen the prosperous Happy Valley's most prized possession: the musical Singing Harp. Can Mickey, Donald, and Goofy find the answer in the irritable Willie the Giant's magnificent castle up in the blue sky?
as Mickey Mouse (voice)
as Donald Duck (voice)
as Goofy (voice)
as Narrator (voice)
as Ludwig Von Drake (voice) (uncredited)
as Willie the Giant (voice) (uncredited)
as Singing Harp (voice) (uncredited)
