| Name | Character | Episodes |
|---|---|---|
| Sascha Hehn | Dr. Markus Merthin | 53 |
| Martina Gedeck | Angelika | 3 |
| Adriana Altaras | Gisi | 3 |
| Özay Fecht | Fatma Yüksol | 3 |
| Suzanne von Borsody | Yvonne Gircke | 2 |
| Petra Zieser | Elisabeth Domday | 2 |
| Manfred Lehmann | Torsten Heidburger | 2 |
| Günther Jerschke | Herr Merthin sen. | 2 |
| Gilbert von Sohlern | Toni Obermeier | 2 |
| Gustav Peter Wöhler | Werner Henninger | 1 |
| Dietrich Mattausch | Björn Schleehuber | 1 |
| Christina Plate | Trixi | 1 |
| Billie Zöckler | Mika Küpper | 1 |
| Franziska Troegner | Lani Trautmann | 1 |
| Armin Dillenberger | Kneipengast | 1 |
| Ingrid van Bergen | Laura Amberg | 1 |
| Joachim Paul Assböck | 1 | |
| Walfriede Schmitt | Beraterin | 1 |
| Sabine Vitua | Mechthild 'Mücke' Homberg | 1 |
| Wookie Mayer | Frau Düsterhoff | 1 |
| Marianne Lindner | Gerda Carolus | 1 |
| Robinson Reichel | Frank | 1 |
| Renate Langer | Passantin | 1 |
| Maria Singer | Oma Jöstel | 1 |
| Max Volkert Martens | Felix Koller | 1 |
| Thomas Bestvater | Autofahrer | 1 |
| Kurt Weinzierl | Walter Richter | 1 |
| Susanne Lüning | Bea Dautz | 1 |
| Cay Helmich | Chris Gatzka | 1 |
| Götz Schubert | Herr Brehme | 1 |
| Jörg Pleva | Karl Schrimke | 1 |
| Jürgen Tarrach | Herr Burger | 1 |
| Wolf-Dietrich Berg | Prof. Albert Peters | 1 |
| Martina Schiesser | Julia 'Jule' Wiechert | 1 |
| Johanna Bittenbinder | Frau Eichhorn | 1 |
| Jochen Kolenda | Horst Stetter | 1 |
| Udo Thomer | Herr Mayrhofer | 1 |