Sylvia Sidney character Mrs. Verloc
Oskar Homolka character Karl Verloc - Her Husband
Desmond Tester character Stevie - Her Young Brother
John Loder character Ted
Joyce Barbour character Renee
Matthew Boulton character Superintendent Talbot
S. J. Warmington character Hollingshead
William Dewhurst character The Professor
Clare Greet character Mrs. Jones (uncredited)
Aubrey Mather character Greengrocer (uncredited)
Austin Trevor character Monocle Man (uncredited)
Charles Hawtrey character Studious Youngster (uncredited)
Martita Hunt character The Professor's Daughter (uncredited)
Torin Thatcher character Mr. Verloc's Visitor (uncredited)
Peter Bull character Mr. Verloc's Visitor (uncredited)
Alfred Hitchcock character Man Walking Past the Cinema as the Light Is Renewed
