Donald Duck in The Ghost of the Grotto

While the ducks are running a kelp-gathering boat in the West Indies, they are told of the mystery of an armored man who appears every fifty years to kidnap a small boy. This time, the armored man kidnaps Dewey, and the ducks fight to free him from the armored man's stronghold in a grotto in a coral reef, beneath a rotten old galleon guarded by an enormous octopus.