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