Friedrich Rudolf Klein-Rogge (24 November 1885 – 29 May 1955) was a German film actor. Klein-Rogge is known for playing sinister figures in films in the 1920s and 1930s as well as being a main-stay in director
Fritz Lang's
Weimar-era films. He is probably best known in popular culture, particularly to
English-speaking audiences, for playing the
archetypal mad scientist role of
C.A. Rotwang in Lang's
Metropolis and as the criminal genius
Doctor Mabuse.