Nessie was the large costume worn by the two workmen
Physical appearance[]
She is a giant loch Ness monster with red sclera eyes, sharp teeth, a gray beard and a light gray belly.
Personality[]
She was terrifying to encounter and was persistent, mostly whenever there's someone in the water or on a boat.
History[]
Scooby-Doo! World of Mystery[]
The gang caught sight of her pursuing a man in a boat and decided to abandon the castle trip they were planning in hopes that what they saw was a real monster.
Nessie soon dived underwater when they got to close, but there were clues left behind, footprints and a large line of the tail on the beach, a long with weirdly placed bubbles.
While camping out for the night to see her again, she scared away Fred and the girls and was gonna get the cowardly duo next, but in a panic. Shaggy threw a pan he was using to cook eggs and sausages in the air which landed on the monsters head, causing it to fall over.
The workmen unmasked.
The costume fell apart a bit revealing it to be the two workmen they met earlier that day, they both created the costume to scare away tourists so they could steal old viking coins at the bottom of loch ness.