Seaweed Monster (Scooby Dude)

The Seaweed Monster was the disguise of Red Herring, Coolsville's young troublemaker.

Physical appearance
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Personality
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Season one
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.

Appearances

 * A Pup Named Scooby-Doo
 * 109. Scooby Dude (no lines)