| Name | Character | Episodes |
|---|---|---|
| Ruby O. Fee | Sophie Kellermann | 26 |
| Denis Moschitto | Harald Jakobs | 26 |
| Peter Lohmeyer | Professor Brehmer | 26 |
| Thomas Arnold | Boris | 13 |
| Arnd Klawitter | Lasinski | 13 |
| Augustin Kramann | Thomas Kern | 13 |
| Anika Mauer | Frau Kellermann | 13 |
| Paul Maaß | Götz | 13 |
| Oliver Wnuk | Rocky | 13 |
| Tim Wilde | Max Forck | 13 |
| Dietrich Hollinderbäumer | Dr. Crohn | 3 |
| Julika Jenkins | Frau Dehning | 2 |
| Ronald Kukulies | Hajo | 2 |
| Suzan Anbeh | Carla Brehmer | 1 |
| Richard Sammel | Alexander Legard | 1 |
| Julia Jäger | Elisabeth Genthin | 1 |
| Armin Dillenberger | Verkehrspolizist | 1 |
| Mickey Hardt | Marius | 1 |