During the heyday of German silent cinema, Rudolf Klein-Rogge was the prototype for the master criminal, the irredeemable arch villain or mad scientist. Born in Cologne, he served as a cadet in a Prussian military academy before finishing his matriculation. He then began to attend acting classes and studying art history in Berlin and Bonn, making his debut on the stage in 1909. After playing in theatres in towns and cities along the Rhine and northern Germany for nearly ten years, he started making films in 1919.His villainous roots first came to the fore in Le cabinet du docteur Caligari (1920), but he really established his reputation in a series of classic expressionist films written by his then-wife Thea von Harbou and directed by Fritz Lang. Of these, the most memorable were his forceful Moriarty-inspired portrayals of the titular character in Le docteur Mabuse (1922), and its later sequel, Le testament du docteur Mabuse (1933). The latter, which has an evil mastermind directing his empire from a madhouse, was so obviously aimed at the Hitler regime, that it was banned by Joseph Goebbels. Klein-Rogge's other noteworthy appearances include King Etzel in Les nibelungen: la mort de Siegfried (1924) and Les nibelungen, la vengeance de Kriemhild (1924); and his insane scientist C.A. Rothwang, creator of the robot creature in Fritz Lang's masterpiece Metropolis (1927). A powerful personality possessed of an almost hypnotic stare and a strong, resonant voice, Klein-Rogge continued on through the 1930's in supporting roles. However, the period of expressionist cinema in Germany had all but run its course and he died in relative obscurity in Graz, Austria, in April 1955.