Dr. Jekyll

Dr. Jekyll is a scientist.

Season two
After his experiments failed he decided to turn to a life of crime by dressing up as the ghost of Mr. Hyde and frame Helga the maid. But the kids were able to solve the mystery and catch Dr. Jekyll.

Appearances

 * Scooby-Doo, Where Are You!
 * Nowhere to Hyde

Trivia

 * Dr. Jekyll said that his great-grandfather was the first Dr. Jekyll. This would make him Dr. Jekyll IV.