Sea monster (Happy Birthday, Scooby-Doo)

The sea monster was a monster in Shaggy Rogers and Scooby-Doo's childhood.

Physical appearance
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Personality
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Early life
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The New Scooby-Doo Mysteries
When Scooby's birthday was celebrated at a special "This Is Your Life", the two was forced to relive the events on a monitor.

Appearances

 * The New Scooby-Doo Mysteries
 * 101. Happy Birthday, Scooby-Doo