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 Angela Roy as Prof. Constanze Winterberg Christian Hockenbrink as Dr. Niklas Rössler Laura Berlin as Julia Weigert Phil Laude as Alexander 'Crazy Alex' Vita Tepel as Rosa Marcial Gizem Emre as Zoe Williams Joyce Ilg as Nadiene 'Nana' Keller Jochen Schropp as Jens Abmeyer Credit Only Reiner Schöne as Prof. Dr. Stefan Jäger
