Keye Luke
James Lee Wong

Lotus Long
Win Lee

Win Lee

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