Spaceship to the Unknown 1966

A heavy condensation of the original serial compresses the original thirteen episodes into an efficient 97 minute feature. 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.

Cast:

Buster Crabbe
Flash Gordon (archive footage) 

Jean Rogers
Dale Arden (archive footage) 

Frank Shannon
Dr. Hans Zarkov (archive footage) 

Charles Middleton
Ming the Merciless (archive footage) 

Priscilla Lawson
Princess Aura (archive footage) 

Richard Alexander
Prince Barin (archive footage)