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 Merciless is up to his old tricks. So it's back to Mongo for Flash, Dale, and Zarkov.

Joel & Garda Sloan, a husband and wife detective team, who also sell rare books in New York, take a vacation to Seaside City. At Seaside, Joel's pal, Mike Stevens is managing and preparing for their beauty pageant. Joel is made one of the judges plus he has invested $5,000 in it, to Garda's dismay. Eric Bartell, promoter, arrives to dupe Stevens. When Ed Connors, New York racketeer arrives, Bartell is mysteriously murdered. Joel and Garda set out to investigate the murder.

A happily married woman lets her catty friends talk her into divorce when her husband strays.

Studio publicist discovers Minnesota skating teacher and takes her to Hollywood. She goes back to Minnesota but he follows her.

Wanting a break from his overzealous fans, a famous movie star hires a Hawaiian plantation owner to switch places with him for a few weeks.

American theatrical manager discovers Greta Muller preparing for the Olympics in Switzerland and brings her to Madison Square Garden.