Theodor Loos was an actor who had a successful Hollywood career. Loos found his beginnings in film with roles in the Gertrud Arnold fantasy "Die Nibelungen" (1924) and the "Metropolis" (1926) film with Brigitte Helm. Loos made film his next project, appearing in the crime feature "Das Testament des Dr. Mabuse" (1933) with Rudolf Klein-Rogge and "Schlussakkord" (1936). Loos was most recently credited in the Peter Lorre crime picture "M" (1986). Loos passed away in June 1954 at the age of 71.