James Lee Wong

Keye Luke

Win Lee, Benton's Secretary

Lotus Long

Tommy Dean

Robert Kellard

Jonas

Willy Castello

Foo

Lee Tung Foo

Radio News Broadcaster

Lynton Brent

Stakeout Cop

Jack Cheatham

Detective in Refrigerator

Heinie Conklin

Policeman

William Gould

Police Officer Stationed at Front Door

Bruce Mitchell

Extra in Audience at Benton's Lecture

William J. O'Brien

Charley Won

Victor Wong

Police Captain Street

Grant Withers

Dr. John Benton / Cyrus Benton in Newspaper (as Charles Miller)

Charles Miller

Dr. Norman Wilkes

Huntley Gordon

Louise Benton

Virginia Carpenter

Charlie Frasier

John Dilson

Detective Grady

Paul McVey

Mason

John Holland

Toreno

Richard Terry

Director

Phil Rosen

Screenplay

George Waggner

Art Direction

Charles Clague

Story

Ralph Gilbert Bettison

Music

Edward J. Kay

Director of Photography

Fred Jackman Jr.

Editor

Jack Ogilvie

Characters

Hugh Wiley

Producer

Paul Malvern