Hardy Boys, The: The Mystery of the Applegate Treasure (television) Serial on the Mickey Mouse Club during the 1956-1957 season. Directed by Charles Haas. Frank and Joe Hardy, sons of a famous detective, try to solve a mystery about a lost treasure themselves. Based on the books by Franklin W. Dixon. Stars Tim Considine, Tommy Kirk, Carole Ann Campbell, Donald MacDonald, Florenz Ames, Russ Conway, Sarah Selby. 20 episodes.