Douglas Wilmer (Lord Germain) and Richard Greene (Robin Hood) would both later play Fu Manchu's arch-enemy Sir Denis Nayland Smith in films starring Christopher Lee as the Chinese criminal mastermind: Wilmer in The Brides of Fu Manchu (1966) and The Vengeance of Fu Manchu (1967) and Greene in The Blood of Fu Manchu (1968) and The Castle of Fu Manchu (1969).