Keye Luke

James Lee Wong

Lotus Long

Win Lee, Benton's Secretary

Grant Withers

Police Captain Street

Charles Miller

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

Huntley Gordon

Dr. Norman Wilkes

Virginia Carpenter

Louise Benton

John Dilson

Charlie Frasier

Paul McVey

Detective Grady

John Holland

Mason

Richard Terry

Toreno

Robert Kellard

Tommy Dean

Willy Castello

Jonas

Lee Tung Foo

Foo

Lynton Brent

Radio News Broadcaster

Jack Cheatham

Stakeout Cop

Heinie Conklin

Detective in Refrigerator

William Gould

Policeman

Bruce Mitchell

Police Officer Stationed at Front Door

William J. O'Brien

Extra in Audience at Benton's Lecture

Victor Wong

Charley Won