Jewel thief (Monster Museum)

An unnamed jewel thief was posing as the security chief at the Natural History Museum.

Scooby-Doo! (DC Comics)
The thief wanted to steal the Hopedfore Double Diamond from the museum. He kidnapped the security chief, disguised himself to take his place, faked a robbery of a set of dinosaur bones, and used dinosaur and monster holograms to create a distraction so he could take the gem.

Appearances

 * Scooby-Doo! (DC Comics)
 * Monster Museum