The Green Ghost.
The Green Ghost unmasked
Mr. Conrad used the disguise of the Green Ghost to counterfeit $5 bills.
Physical Appearance
The Green Ghost is just big green and slimy with red eyes.
A Pup Named Scooby-Doo
Season One
Appearances
Other Appearances
Scooby-Doo 2: Monsters Unleashed
Main Article: 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.
Green Ghost, the fourth costume on the right hand corner.
Trivia
The Phantom Shadows from A Night of Fright is No Delight are sometimes also known as Green Ghosts, but they look nothing like this character.