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.

1939 American Western film directed by Michael Curtiz

Tom Chatterton is called a coward because he will not enlist in the Home Guard during the Civil War -- his mother is dying and he does not wish to leave while she is still alive. When she dies and the Yankees attack, he seizes command of the Home Guard and leads them to victory, proving himself a hero and dying in the process.