 The film was one of three Harry Alan Towers made at the Hong Kong studios of Run Run Shaw the others being "The Vengeance of Fu Manchu" (also directed by Jeremy Summers, with Christopher Lee in the title role and Maria Rohm again named Ingrid) and "The Million Eyes of Sumuru" (with Klaus Kinski and Maria Rohm in supporting roles).In September 1966 Don Sharp was going to direct.The film originally planned to feature George Sanders and Basil Rathbone as two of the Dragons.