| Name | Character | Episodes |
|---|---|---|
| Rudolf Kowalski | Markus Zerner | 8 |
| Anja Kling | Barbara Falk | 2 |
| Jeanne Goursaud | Lisa | 2 |
| Devrim Lingnau | Nesrin | 1 |
| Jean-Yves Berteloot | Jérôme Lambert | 1 |
| Christian Berkel | Erich Kupka | 1 |
| Antonio Wannek | Michael 'Mischa' Mohn | 1 |
| Milton Welsh | Arno Biewer | 1 |
| Hendrik Duryn | Mirco Hambach | 1 |
| Rafael Gareisen | Number Six | 1 |
| David Rott | André Collmann | 1 |
| Constantin von Jascheroff | Paul Satzmann | 1 |
| Paula Kroh | Laura Schäffler | 1 |
| Joachim Król | Wolfgang Abeck | 1 |
| Bernadette Heerwagen | Kathrin Brandmann | 1 |
| Julius Nitschkoff | Lenny Haas | 1 |
| Laura de Boer | Céline Schubecker | 1 |
| Patrick von Blume | Dr. Bischoff | 1 |
| Gerdy Zint | Karl Brandmann | 1 |
| Jörg Malchow | Gerrit Rosen | 1 |
| Robert Schupp | Gerard Schubecker | 1 |