The Scooby Snack Monster was the disguise of Penelope Bailey.
It's entire body is covered with a thick, brown layer of Scooby Snacks batter. For some unexplained reason, it formed a working face, with glowing yellow eyes.
The real monster doesn't take kindly to thieves who wanted the secret recipe.
Powers and abilities
Being a monster made entirely out of Scooby Snack batter, it leaves a trail of batter wherever it goes.
Several months ago an employee tried to taste the Scooby Snack batter, but fell in and mutated into a sludge monster made out of the same batter.
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The monster attacked two spies, who were trying to break into the vault and steal the secret recipe. One barely able to escape alive, but the other did not.
Shaggy and Scooby ran into the monster while wandering around the factory. It trapped them in one of the fan tubes, and nearly sliced them to pieces.
Trudy, who was followed by Fred, hid in a container of batter, and spotted Shaggy and Scooby eating Scooby Snacks, and attempted to get rid of them twice by baking and drowning them. But, they were able to escape both traps.
It tried to sneak up on them again, but ended up chased by the rest of the gang in the tour tram. They trapped it in the stabilization chamber, where the sprinklers melted the monster, revealing to be Trudy, who was a spy trying to steal the secret recipe. However, the real monster showed up, and pursued the gang all over the factory, until it was trapped in a giant Scooby Snack box, and unmasked as Penelope Bailey.
She wore the costume to protect her company from industrial espionage, so she was forgiven.