Guest Stars Rolf Kanies as Stefan Tremmel Annika Ernst as Elena Lange Haley Louise Jones as Kirsten Maybach Paul Bohse as Leon Lange Yung Ngo as Dr. Lee Kwon Christian Hockenbrink as Dr. Niklas Rössler Laura Berlin as Julia Weigert Hubertus Hartmann as Prof. Dr. Oliver Kohaupt Reiner Schöne as Prof. Dr. Stefan Jäger Jennifer Poppek as Sabine Steenken Valerie Potozki as Siri Arvidsson Stefan Gebelhoff as Ernst Velten Johanna Falckner as Jeanette Chryssanthi Kavazi as Schwester Doris Martin Thiel as SpuSi Christoph Drobig as IT-Experte Klaus-Peter Strogalski as Schachspieler Stefan Hartmann as Glubbie Raphaela Kiczka as Studentin
