 Henry FondaDimitri Koulov | Dimitri Koulov |
 Robert RyanGeneral Bruce | General Bruce |
 Vittorio GassmanPerego / Ferrari | Perego / Ferrari |
 Annie GirardotSuzette / Monique | Suzette / Monique |
 Peter van EyckPetchatkin | Petchatkin |
 BourvilLalande | Lalande |
 Robert HosseinDupont | Dupont |
 Wolfgang LukschyRussian General | Russian General |
 Mario AdorfCallaghan | Callaghan |
 Jacques SernasGlazov | Glazov |
 Georges MarchalSerge | Serge |
 Klaus KinskiRussian Agent | Russian Agent |
 Gabriel GobinO'Hara | O'Hara |
 Jackie BlanchotJoe | Joe |
 Violette MarceauLisa | Lisa |
 Louis ArbessierIvanov | Ivanov |
 Rossana CanghiariSwimming Pool Girl (uncredited) | Swimming Pool Girl (uncredited) |
 Nino CrismanColonel de Luca (uncredited) | Colonel de Luca (uncredited) |
| OOreste PalellaCarabinieri marshal (uncredited) | Carabinieri marshal (uncredited) |
 Gabriella Giorgelli(uncredited) | (uncredited) |
 Maria Grazia BuccellaNatalia | Natalia |
 Helmut WildtPerry | Perry |
 Sylvain LévignacKarl | Karl |
| FFederico BoidoSernas' Henchman at First Meeting with Ferrari (uncredited) | Sernas' Henchman at First Meeting with Ferrari (uncredited) |
 Aldo CantiCarabiniere (uncredited) | Carabiniere (uncredited) |
 Pietro CeccarelliSernas' Bald Henchman (uncredited) | Sernas' Bald Henchman (uncredited) |
| JJürgen DraegerProfessor's Assistant | Professor's Assistant |
 Horst JansonSergeant in Military Office (uncredited) | Sergeant in Military Office (uncredited) |
 Al ManciniCorporal Colombo (uncredited) | Corporal Colombo (uncredited) |
 Renato TerraAgente italiano camuffato (uncredited) | Agente italiano camuffato (uncredited) |
