The Sultan of Zanzibar has a harbor infested with sharks, which makes it impossible for ships to trade with him. In an attempt to fix the problem, he brings twelve hippos into the harbor to keep the sharks away. His idea works well enough, but once the hippos are no longer a novelty and the people no longer feed them, they begin to starve. After the hungry hippos rampage through the city looking for food, Aban-Khan, the king's adviser, slaughters all the hippos except one, a little hippo named Hugo.
Burl Ives
as Narrator - Vocalist (voice)
Robert Morley
as Sultan (voice)
Paul Lynde
as Aban-Khan (voice)
Jesse Emmett
as Royal Magician (voice)
Ronnie Cox
as Jorma (voice)
Percy Rodriguez
as Jorma's Father (voice)
Len Maxwell
as Judge (voice)
Marie Osmond
as Vocalist (voice)
Jimmy Osmond
as Vocalist (voice)
Don Marshall
as Mr. M'Bow-Wow - Additional Characters (voice)
Frank Welker
as Special Vocal Effects (voice)
Nancy Wible
as Special Vocal Effects (voice)
