After arriving in Britain, Veidt perfected his English and starred in the title roles of the original anti-Nazi versions of "The Wandering Jew" (1933) and "Jew Süss" (1934), the latter film was directed by the exiled German-born director Lothar Mendes and produced by Michael Balcon for Gaumont-British. He naturalised as a British subject on 25 February 1939. By this point multi-lingual, Veidt made films both in French with expatriate French directors and in English, including three of his best-known roles for British director Michael Powell in "The Spy in Black" (1939), "Contraband" (1940) and "The Thief of Bagdad" (1940).