Dale is sent to a prison world to repair the machinery used to create oxygen, without which not only the ruthless prisoners, but the warden and his guards would soon perish. Flaggert, the most notorious murderer in the galaxy manages to break out of his cell and hides on Flash Gordon's spaceship in order to make good his escape and have his revenge on the man who sent him to prison in the first place. br br Directed by Gunther von Fritschbr Starring Steve Holland, Irene Champlin, Joseph Nashbr br Castbr Steve Holland as Flash Gordonbr Irene Champlin as Dale Ardenbr Joseph Nash as Dr. Hans Zarkovbr Henry Beckman as Cmdr.