James Lee Wong

Boris Karloff

Acting

Police Capt. Sam Street

Grant Withers

Acting

Myra Ross

Maxine Jennings

Acting

Olga Petroff / Countess Dubois / Sophie Dome

Evelyn Brent

Acting

Devlin

George Lloyd

Acting

Anton Mohl

Lucien Prival

Acting

Carl Roemer

John St. Polis

Acting

Theodore Meisle

William Gould

Acting

Christian Wilk

Hooper Atchley

Acting

Simon Dayton

John Hamilton

Acting

Russell

Wilbur Mack

Acting

Tchin

Lee Tung Foo

Acting

Tommy

Lynton Brent

Acting

Mrs. Roemer

Grace Wood

Acting

Lescardi (uncredited)

Frank Bruno

Acting

Ambulance Doctor (uncredited)

Ed Cassidy

Acting

Chemistry Lab Director (uncredited)

Wheaton Chambers

Acting

Warehouse Man (uncredited)

Clancy Cooper

Acting

John (uncredited)

George DeNormand

Acting

Coroner (uncredited)

Lester Dorr

Acting

Wilk's Butler (uncredited)

Herbert Evans

Acting

Dock Worker (uncredited)

Dick Reinhart

Acting