Conspiradores Diabólicos (1969) was made by several production personnel who had worked on Sir Roger Moore's O Santo (1962) television series.
English language movie debut of Belgian actress Claudie Lange. She was featured in her largest English-speaking role.
Sir Roger Moore portrayed a character, who has said to have been a James Bond-type, prior to Moore first playing Bond in Com 007 Viva e Deixe Morrer (1973).
This movie featured Sir Roger Moore and Bernard Lee, who featured in the James Bond film franchise, as James Bond and M, respectively, in Com 007 Viva e Deixe Morrer (1973), 007 Contra o Homem com a Pistola de Ouro (1974), 007 - O Espião que me Amava (1977), and 007 Contra o Foguete da Morte (1979). This is the only theatrical movie, outside of the Bond movies, that the two acted in together.
Roger Moore did not make a successful crossover into a feature film career with Conspiradores Diabólicos (1969) or with another film the following year, O Homem Que Não Era (1970), so he returned to television, playing Lord Brett Sinclair in the ITC series, The Persuaders! (1971). The following year, however, Moore was tapped by producers Albert Broccoli and Harry Saltzman to take over the lead role in the James Bond franchise; his first film as 007 was Com 007 Viva e Deixe Morrer (1973).