Kadro (22)
Buster CrabbeFlash Gordon (archive footage)
Jean RogersDale Arden (archive footage)
Frank ShannonDr. Hans Zarkov (archive footage)
Charles MiddletonMing the Merciless (archive footage)
Priscilla LawsonPrincess Aura (archive footage)
Richard AlexanderPrince Barin (archive footage)
Jack 'Tiny' LipsonKing Vultan (archive footage)
James PiercePrince Thun (archive footage)Earl AskamOfficer Torch (archive footage)
Richard TuckerProf. Gordon (archive footage)
George ClevelandProf. Henson (archive footage)
Lon PoffThe High Priest (archive footage)Charles McMurphyAtom Furnace supervisor (archive footage)
Theodore LorchPriest #2 (archive footage)
Duke York(scenes deleted) (archive footage) (as Duke York Jr.)
Lynton BrentTranscontinental airplane pilot (archive footage) (uncredited)
Al FergusonTelescreen monitor (archive footage) (uncredited)
Fred Kohler Jr.Robot / Ming soldier (archive footage) (uncredited)
Bull MontanaMonkey-Man (archive footage) (uncredited)
Constantine RomanoffMonkey-Man (archive footage) (uncredited)
Glenn StrangeRobot / Ming soldier / Gocko (archive footage) (uncredited)
Harry WilsonCaptured soldier (archive footage) (uncredited)