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In page Fritz Lang:

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In 1920, Lang met his future second wife, the writer Thea von Harbou through director Joe May. Harbou co-wrote and directed the film “Das wandernde Bild” with Lang.[1] She co-wrote every Harbou Lang film till 1933, including Dr. Mabuse, der Spieler ("Dr. Mabuse the Gambler," 1922 – which ran for over four hours, in two parts in the original version, and was the first in the Dr. Mabuse trilogy), the five-hour Die Nibelungen (1924), the dystopian film Metropolis (1927), and the science fiction film Woman in the Moon (1929). Metropolis went over budget, to the UFA's detriment. It was a financial flop, as were his last silent films Spies (1928) and Woman in the Moon, produced by Lang's own company.[citation needed]