Gustav Fröhlich Freder Fredersen Brigitte Helm Maria / The Machine Man Alfred Abel Johann 'Joh' Fredersen Rudolf Klein-Rogge C.A. Rotwang Theodor Loos Josaphat Fritz Rasp The Thin Man Erwin Biswanger No. 11811 - Georgy Heinrich George Grot Fritz Alberti Creative Human - Man Who Convinces Babel (uncredited) Grete Berger Working Woman (uncredited) Olly Boeheim Working Woman (uncredited) Heinrich Gotho Master of Ceremonies (uncredited) Gottfried Huppertz Man Playing Violin (uncredited) Georg John Working Man Who Causes Explosion of M-Machine (uncredited) Margarete Lanner Woman of Eternal Gardens / Lady in Car (uncredited) Rose Lichtenstein Working Woman (uncredited) Hanns Leo Reich Marinus (uncredited) Arthur Reinhardt Working Man (uncredited) Curt Siodmak Working Man (uncredited) Henrietta Siodmak Working Woman (uncredited) Günther Rittau Director Walter Ruttmann Director Fritz Lang Director Karl Freund Director Slatan Dudow Director