Two opposing characters are hidden in the person of the inconspicuous London gentleman Dr. Warren and Janus.
Conrad Veidt
Dr. Warren
Magnus Stifter
Warrens Freund
Margarete Schlegel
Grace
Willy Kaiser-Heyl
o. A.
Bela Lugosi
Warren's Butler
Margarete Kupfer
Danny Guertler
Gustav Botz
Jaro Fürth
Hans Lanser-Rudolf
Marga Reuter
Lanja Rudolph
