Spaceship to the Unknown

Flash Gordon (archive footage)

Dale Arden (archive footage)

Dr. Hans Zarkov (archive footage)

Ming the Merciless (archive footage)

Princess Aura (archive footage)

Prince Barin (archive footage)

King Vultan (archive footage)

Prince Thun (archive footage)

Officer Torch (archive footage)

Prof. Gordon (archive footage)

Prof. Henson (archive footage)

The High Priest (archive footage)

Atom Furnace supervisor (archive footage)

Priest #2 (archive footage)

(scenes deleted) (archive footage) (as Duke York Jr.)

Transcontinental airplane pilot (archive footage) (uncredited)

Telescreen monitor (archive footage) (uncredited)

Robot / Ming soldier (archive footage) (uncredited)

Monkey-Man (archive footage) (uncredited)

Monkey-Man (archive footage) (uncredited)

Robot / Ming soldier / Gocko (archive footage) (uncredited)

Captured soldier (archive footage) (uncredited)