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.
as Flash Gordon
as Dale Arden
as Emperor Ming
as Sonja
as Dr. Zarkov
as Professor Gordon
as Dr. Frohmann
as Professor Arden
as Princess Aura
as Captain Roka
as Prince Barin
as Captain Torch
as Lieutenant Thong
as Captain Turan
as Professor Karm
as Janda
as Keedish
as Count Korro
as Verna
as Professor Drok
as Captain Sudan
as Ronal (uncredited)
as Queen Fria (uncredited)
as General Lupi (uncredited)
as Man with Thinking Brain (uncredited)
as Man of Low Intellect (uncredited)
as Barin's Ship #5 Commander (uncredited)
as Guard Kroad (uncredited)
as Prince of the Rock People (uncredited)
as King of the Rock People (uncredited)
as Professor Gordon's Radio Operator (uncredited)
as Professor Gordon's Assistant (uncredited)
as Ming's Soldier / Arborian Sentry (uncredited)
as Ming's Soldier (uncredited)
as Ming's Soldier (uncredited)
as Scientist (uncredited)
as Scientist (uncredited)
as Scientist (uncredited)
as Olga (uncredited)
as Ming's Dancing Girl (uncredited)
as Ming's Gong Girl (uncredited)
as (uncredited)
as (uncredited)
as Ming's Pilot (uncredited)
as Arborian Prison Guard (uncredited)
as Guard (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as (uncredited)
as Various Characters (voice) (uncredited)
