| Name | Character | Episodes |
|---|---|---|
| Hendrik Duryn | Stefan Vollmer | 85 |
| Jeanne Goursaud | Bibi | 12 |
| Julius Nitschkoff | Luis Schmitz | 3 |
| Florian Fitz | Direktor Schwengers | 2 |
| Béla Gabor Lenz | Oleg Sobolew | 2 |
| Sabine Vitua | Lydia | 2 |
| Zoe Moore | Jana | 1 |
| Georg Blumreiter | Vater Wasilewski | 1 |
| Runa Greiner | Cleo | 1 |
| Lilia Lehner | Frau Krüger | 1 |
| Mimi Fiedler | Anja | 1 |
| Milena Tscharntke | Louisa | 1 |
| Siemen Rühaak | Dr. Jansen | 1 |
| Klaus Nierhoff | Dr. Heller | 1 |
| Patrick von Blume | Schulrat Rückdiem | 1 |
| Marcus Calvin | Registrar | 1 |
| Frederick Lau | Picko | 1 |
| Birthe Wolter | Iris | 1 |