Mr. Wong, Detective

Boris Karloff

as

James Lee Wong

Grant Withers

as

Police Capt. S...

Maxine Jennings

as

Myra Ross

Evelyn Brent

as

Olga Petroff /...

George Lloyd

as

Devlin

Lucien Prival

as

Anton Mohl

John St. Polis

as

Carl Roemer

William Gould

as

Theodore Meisle

Hooper Atchley

as

Christian Wilk

John Hamilton

as

Simon Dayton

Wilbur Mack

as

Russell

Lee Tung Foo

as

Tchin

Lynton Brent

as

Tommy

Grace Wood

as

Mrs. Roemer

Frank Bruno

as

Lescardi (uncr...

Ed Cassidy

as

Ambulance Doct...

Wheaton Chambe...

as

Chemistry Lab ...

Clancy Cooper

as

Warehouse Man ...

George DeNorma...

as

John (uncredit...

Lester Dorr

as

Coroner (uncre...

Herbert Evans

as

Wilk's Butler ...

Dick Reinhart

as

Dock Worker (u...