Blake of Scotland Yard

Hayden Stevenson

Angus Blake

Grace Cunard

Queen of Diamonds

Gloria Grey

Lady Diane Blanton

Herbert Prior

Lord Blanton

Monte Montague

Jarvis

Wilbur Mack

Albert Drexel

Al Hart

The Spider (as Albert Hart)

Walter Brennan

Henchman (uncredited)

George Burton

Henchman (uncredited)