Walt Disney
Mickey Mouse
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?
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Walt Disney
Mickey Mouse
Clarence Nash
Donald Duck
Pinto Colvig
Goofy
Sterling Holloway
Narrator
Paul Frees
Ludwig Von Drake
W.F. Banes
Mickey Mouse's Singing Voice
Edgar Bergen
Narrator
Billy Gilbert
Willie the Giant
Anita Gordon
Singing Harp
James MacDonald
Mickey Mouse (some lines)
