The Hardy Boys·ABC
All episodes
1 season · 17 eps
Season 1
Mystery of the Desert Giant / The Viking Symbol Mystery Episode 2
The Secret of the Old Mill / The Missing Chums Episode 3
The Secret Warning / The Mystery of the Aztec Warrior Episode 4
When their nocturnal search of the Applegate property is suddenly interrupted, the Hardys learn more about the mysterious treasure---and discover that they're not the only ones looking for it. Applegate: Florenz Ames. Iola: Carole Ann Campbell.
The Mystery of Cabin Island / The Hidden Harbor Mystery Episode 5
The Secret of the Caves / A Figure In Hiding Episode 6
The Ghost at Skeleton Rock / The Mystery of the Chinese Junk Episode 7
The Shore Road Mystery / The Sign of the Crooked Arrow Episode 8
What Happened at Midnight / The Clue in the Embers Episode 9
The Clue of the Screeching Owl / The Yellow Feather Mystery Episode 10
The House on the Cliff / Mystery of the Spiral Bridge Episode 11
The Mystery at Devil's Paw / The Haunted Fort Episode 12
The Sinister Signpost / The Melted Coins Episode 13
The Mark on the Door / The Flickering Torch Mystery Episode 14
The Secret of Wildcat Swamp / The Clue of the Broken Blade Episode 15
The Hooded Hawk Mystery / The Short Wave Mystery Episode 16
The Phantom Freighter / The Secret of Pirates Hill Episode 17
17 episodes in Season 1
Some details come from TheTVDB.