| Name | Character | Episodes |
|---|---|---|
| Capucine | Gräfin Simone von Altenberg | 10 |
| Ursula Karven | Lisa Prentice | 10 |
| Albert Fortell | Graf Henry von Altenberg | 10 |
| Franco Nero | Sandro Castellani | 1 |
| Aurore Clément | Laura Cellini | 1 |
| Lewis Collins | Ernest Sinclair | 1 |
| Marisa Berenson | Ann Ryder | 1 |
| Helen Vita | Frau Kessel | 1 |
| Lauren Hutton | Gerda Minsker | 1 |
| Gottfried John | Herr Mannheim | 1 |
| Hans Peter Hallwachs | Berthold Schweiber | 1 |
| Rossano Brazzi | Prof. Donelli | 1 |
| Fernando Rey | Dekker | 1 |
| Friedrich von Thun | Carl von Altenberg | 1 |
| Günther Maria Halmer | Barry Ryder | 1 |
| Joachim Bißmeier | Herr Arnold | 1 |
| Horst Janson | Harlinger | 1 |
| Arthur Brauss | John Domack | 1 |
| Denise Virieux | Juliette Sabin | 1 |
| Erika Remberg | Gabriella Mancini | 1 |
| Peter Kuiper | Kümmel | 1 |
| Siemen Rühaak | Willem Langer | 1 |
| Horst Kummeth | Würstchenverkäufer Marken | 1 |