| Episode cast overview, first billed only: |
 | Michele Placido | - | Commissario Corrado Cattani |
 | Giuliana de Sio | - | Giulia Antinari |
 | Alain Cuny | - | Nicola Antinari |
 | Francisco Rabal | - | Abbott Lovani |
 | Marie Laforêt | - | Anna Antinari |
| Luigi De Filippo | - | Judge Venturi (credit only) |
 | Remo Girone | - | Tano Cariddi |
| Pierre Vaneck | - | Carlo Antinari (archive footage) |
 | Paul Guers | - | Professor Gianfranco Laudeo (archive footage) |
| Cyrus Elias | - | Agent Bert Di Donato (archive footage) |
 | Franco Trevisi | - | Kemal Yfter (archive footage) |
| Alice Di Giuseppe | - | Greta Antinari |
| Adalberto Maria Merli | - | Dino Alessi |
 | Lino Capolicchio | - | Professor Mattinera |
 | François Périer | - | Avvocato Terrasini |
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