The Pterodactyl Ghost is a villain in the Scooby-Doo franchise.
The Scooby Doo Show
In the The Scooby-Doo Show episode "Hang In There, Scooby-Doo!", The Pterodactyl Ghost was a scary creature. It terrorized a hang gliding contest. He was actually unmasked to be a man named Johnny.
Scooby-Doo 2 Monsters Unleashed
In the second live-action movie we had a flashback scene to the gang's original case, although it was a completely different story to the one from the show. Here he was a man in mechanical wings and a mask, and he robbed banks to pay for his crazy experiments on creating real monsters. Then it was supposed that Jonathan died falling off of the prison roof trying to escape. He had actually survived and was the mastermind behind the whole mystery in the movie. He made another Pterodactyl Ghost costume and made a monster out of it. The Pterodactyl Ghost tried to catch Scooby-Doo in the monster battle, but the Pterodactyl Ghost didn't know where he was going while he watched Scooby catch the control panel and the Pterodactyl Ghost splats in the Tar Monster's Belly and he drowns in the tar and is extinct. The Pterodactyl Ghost was lying dead in the tar when the Skeleton Men and the Tar Monster start to die.
He was also an enemy in this game.
Scooby-Doo Mystery Incorporated