Gordon Flemyng Director Peter Cushing Dr. Who Actor Roy Castle Ian Actor Jennie Linden Barbara Actor Roberta Tovey Susan Actor Barrie Ingham Alydon Actor Michael Coles Ganatus Actor Geoffrey Toone Temmosus Actor Mark Peterson Elyon Actor John Brown Antodus Actor Yvonne Antrobus Dyoni Actor Milton Subotsky Screenwriter, Producer Max Rosenberg Producer Joe Vegoda Executive Producer John Wilcox Cinematographer Oswald Hafenrichter Film Editing Malcolm Lockyer Original Music Bill Constable Art Director Scott Slimon Set Decoration