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?
Walt Disney
Mickey Mouse (voice)
Clarence Nash
Donald Duck (voice)
Pinto Colvig
Goofy (voice)
Sterling Holloway
Narrator (voice)
Paul Frees
Ludwig Von Drake (voice) (uncredited)
Billy Gilbert
Willie the Giant (voice) (uncredited)
Anita Gordon
Singing Harp (voice) (uncredited)
