|This needs a stretch. (Feel to remove when satisfied of completion.)|
Its a monster covered entirely (except for its legs) in seaweed with a pair of red eyes.
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A Pup Named Scooby-Doo
When Shaggy Rogers and Scooby-Doo went to go for a quick surf before going into the Marine Institute, the Seaweed Monster rose from the ocean, scaring the entire gang; until Daphne Blake saw the bottom of its legs, which hadn't been covered, and instantly recognised them as belonging to Red Herring, who followed them to the beach.