|This needs a stretch.|
It was a short humanoid covered in a purple sludge from the swamp, with swirling yellow eyes.
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A Pup Named Scooby-Doo
As the gang walked into Weirdo Woods, Red's "secret" hideout, to question him about Shaggy Rogers's missing bike, Shaggy feared a swamp monster would rise from the ground and grab them by the feet. A few minutes later it did happen, only to be Red, himself, trying to scare them.