Disaster seems imminent when scientists discover that the planet Mongo is about to crash into Earth. Luckily, heroic young Flash Gordon is on hand to lead an investigative mission into outer space and onto the speedily approaching planet. There, he and his best girl, Dale, who is along for the ride, learn that Ming, the devious ruler of Mongo, has purposely put the planet on a collision course with Earth, and only Flash can stop him.
Buster Crabbe
Jean Rogers
Frank Shannon
Charles Middleton
Priscilla Lawson
Richard Alexander
Jack 'Tiny' Lipson
James Pierce
Theodore Lorch
Earl Askam
Richard Tucker
George Cleveland
Glenn Strange
Lon Poff
Constantine Romanoff