Buster Crabbe. Buster Crabbe was 58 in Peril from the Planet Mongo as 'Flash Gordon'.
Carol Hughes. Carol Hughes was 56 in Peril from the Planet Mongo as 'Dale Arden'.
Charles Middleton. Charles Middleton would have been no older than 74 in Peril from the Planet Mongo as 'Ming the Merciless'.
Anne Gwynne. Anne Gwynne was 48 in Peril from the Planet Mongo as 'Sonja'.
Frank Shannon. Frank Shannon would have been no older than 84 in Peril from the Planet Mongo as 'Dr. Zarkov'.
Shirley Deane. Shirley Deane was 53 in Peril from the Planet Mongo as 'Princess Aura'.
Lee Powell. Lee Powell would have been no older than 36 in Peril from the Planet Mongo as 'Roka (an Arborian)'.
Alex Raymond. Alex Raymond would have been no older than 46 in Peril from the Planet Mongo as 'Writer'Basil Dickey. Basil Dickey would have been no older than 75 in Peril from the Planet Mongo as 'Writer'George H. Plympton. George H. Plympton was 77 in Peril from the Planet Mongo as 'Writer'Barry Shipman. Barry Shipman was 54 in Peril from the Planet Mongo as 'Writer'