Boris Karloff

James Lee Wong

Grant Withers

Police Capt. Sam Street

Dorothy Tree

Valerie Edwards

Craig Reynolds

Peter Harrison

Ivan Lebedeff

Michael Strogonoff

Holmes Herbert

Prof. Ed Janney

Morgan Wallace

Brandon Edwards

Lotus Long

Drina

Chester Gan

Sing

Hooper Atchley

Carslake

Bruce Wong

Asian Man

Jack Kennedy

Police Guard

Lee Tung Foo

Willie

Wilbur Mack

Ballstics Expert

Dick Morehead

Police Detective

Joe Devlin

Police Lt. George Devlin

I. Stanford Jolley

Charades-Player