Tim Considine

Frank Hardy

Tommy Kirk

Joe Hardy

Florenz Ames

Silas Applegate

Russ Conway

Fenton Hardy

Sarah Selby

Aunt Gertrude Hardy

Robert Foulk

Jackley the Plumber

Carole Ann Campbell

Iola Morton

Donald MacDonald

Perry Robinson

Arthur Shields

Boles

Andy Clyde

Lacey

John Baer

Eric

Hugh Sanders

Mr. Binks