A group of people find themselves trapped in a creepy mansion, complete with secret passageways, a mad doctor and a murderous gorilla.
A group of communist spies plan to blow up an essential commercial artery, the Panama Canal. To this end, they have kidnapped a nuclear scientist and are traveling by steamship to the coast of South America. Luckily for western civilization, the hard-nosed ship's captain, played by Barton MacLane, has other ideas.
Alfalfa gives up being "King of the Crooners" to sing opera, but a nightmare of being under the thumb of an evil producer sends him back to his roots.
