Boris Karloff as James Lee Wong

Marjorie Reynolds as Roberta 'Bobbie' Logan

Grant Withers as Capt. Bill Street

Charles Trowbridge as John T. Forbes

Frank Puglia as Harry 'Hardway' Lockett

Craig Reynolds as Frank Belden, Jr.

Lita Chevret as Tanya Serova

Harry Strang as Det. Ballard

Hooper Atchley as Frank Belden, Sr.

Jason Robards Sr. as Griswold

Richard Loo as Jeweler

Jack Kennedy as Mike

C.E. Anderson as Cap Anderson

Allan Cavan as Radio Station Owner

Tristram Coffin as Hotel Desk Clerk

Nick Copeland as The Crank Informant

Pauline Drake as Bessie, Switchboard Operator

Harry Harvey as Radio Salesman

Elsa Janssen as Hotel Maid

I. Stanford Jolley as Soapy

Donald Kerr as The Drunk

Wilbur Mack as Police Medical Examiner

Bert Moorhouse as Card Player

James C. Morton as Policeman Clancy

Paul Scardon as Homer Lyons - Informant