Go Away Ghost Ship

Air date: 12/13/69

The newspaper reports that local shipping magnate C.L. Magnus's ships are being haunted by the ghost of the pirate Redbeard. After reading the story and consulting Magnus, the gang ventures out into the bay, but soon find themselves kidnapped by Redbeard and his crew. Eventually he is unmasked to be Mr. Magnus who was trying to avoid bankruptcy by stealing cargo from his own ships.
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A Night of Fright is No Delight

Air date: 1/10/70

Scooby-Doo is a potential heir to the fortune of Colonel Beaureguard Sanders...provided he stays the night in the Colonel's allegedly haunted Southern mansion. This proves to be more difficult than first assumed when two green phantom figures do away with the other four heirs and set their sights on Scooby and the gang. The green ghouls are unmasked to be Mr. Creeps and Mr. Crawls who were trying to make people think the house was haunted so they could keep control of Colonel Sanders's fortune.
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That's Snow Ghost

Air date: 1/17/70

A planned ski-trip to Wolf's End Lodge goes awry when it seems that a Yeti-like Snow Ghost is haunting the mountain ridge. In their search for clues, the gang eventually meet an frightened Tibetan Monk (who gives them information on the Yeti) and then turn up at an old abandoned saw mill, where they find both clues and danger. The Snow Ghost he is unmasked to be Mr. Greenway who was a jewel thief & using the sawed logs to smuggle them away.
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Nowhere to Hyde

Air date: 9/12/70

On their way home from the Malt Shop, the gang encounters "The Ghost of Mr. Hyde", a known jewel thief, sneaking into a spooky house. The house turns out to be the home of Dr. Jekyll, who fears he may be transforming into the Ghost of Mr. Hyde. The gang begins searching the house for clues, pegging the maid as a likely suspect, but are pursued at every turn by the ghost. Eventually, they discover the maid was an gymnast, and was actually the "ghost".
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Mystery Mask Mix-Up

Air date: 9/19/70

Daphne buys a decorative, and purportedly cursed, mask in Chinatown, and is subsequently kidnapped by a pair of ghastly ancient Chinese figures. The rest of the gang trail the kidnappers to the temple of the evil Zen Tuo, who is apparently haunting the temple and wants to do away with the gang. Actually, it is all a cover for a spy ring, that used the pawn-shop to covertly transmit information.
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Jeepers It's the Creeper

Air date: 10/3/70

A school dance at a rural barn is disrupted by The Creeper, a zombie-like figure who has been seen robbing banks at night in town. The gang searches the woods and countryside for clues, encountering an insane old hermit and a newborn baby chick, who comes to think Scooby-Doo is its mother.
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Scooby's Night with a Frozen Fright

Air date: 9/26/70

Sea-fishing Shaggy catches, of all things, an ancient caveman frozen in a block of ice. The kids take the frozen caveman to Oceanland, the local aquarium. When they come back to the aquarium later that night to retrieve Shaggy's fishing pole, they find that the ice has melted and the caveman is now apparently alive and roaming the grounds. Eventually, it is discovered that the scientist in charge was the "caveman", and was trying to steal a rival scientist new "dolphin communicator".