Ghost (A Bicycle Built for Boo!)

Mr. Conrad used the disguise of a green Ghost to counterfeit $5 bills.

Physical appearance
The Ghost is just a big, green and slimy monster with red eyes.

Season one
(A Bicycle Built For Boo!)

Appearances

 * A Pup Named Scooby-Doo - A Bicycle Built For Boo!

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