Guest Stars Jon Fletcher as Marcel Grossmann Gwendolyn Ellis as Young Elsa Einstein Zoe Telford as Clara Haber Caspar Griffiths as Eduard Einstein (Age 4) Edan Hayhurst as Hans Albert Einstein (Age 10) Luke Allen-Gale as Erwin Freundlich Radivoje Bukvić as Vladimir Varicak Katharina Sporrer as Kate Hirschberg Co Starring Lily Dodsworth-Evans as Ilse Einstein Amalia Kahn as Margot Zachary Baharov as Russian General Nick Waring as Gustav Krupp Charleigh Bailey as Bertha Krupp Johannes Franke as Tobias Zdeněk Piškula as Freundlich's Assistant Radik Golovkov as Russian Lieutenant