Ghost (A Bicycle Built for Boo!)



The Swamp Monster was the first mystery that Mystery Inc. ever solved. His first appearance was in A Bicycle Built for Boo! He wanted to counterfeit money. He reprinted 5 dollar bills.

Scooby-Doo 2: Monsters Unleashed
Although he is not one of the monsters Jonathan Jacobo brought to life, he is seen in the Coolsonian Criminology Museum.