A mysterious plague, the Purple Death, ravages the earth. Dr. Zarkov, investigating in his spaceship, finds a ship from planet Mongo seeding the atmosphere with dust. Sure enough, Ming the…

While visiting the circus with his family, Charlie is recruited by the big top’s co-owner to investigate threatening letters that he’s received.

When a busybody teacher in a girls’ finishing school finds a love letter from a student to an unknown man, a minor scandal erupts.