Dr. Jekyll is a scientist.
He is a Caucasian male with brown hair and wears glasses.
Good-natured, but rather under pressure and in depression because of his experiments having gone bad, which led him to a life of crime.
Scooby-Doo, Where Are You!
After his experiments failed he decided to turn to a life of crime by dressing up as the ghost of Mr. Hyde. When after one of his robberies the gang followed him to his home, he came up with a plan to frame Helga the maid. He tells them the phony story about the vitamin formula, and then plants a bunch of fake clues for them to find that would make it look like Helga was the ghost. But they were able to solve the mystery and catch Dr. Jekyll. The important clue connected to him were the suction cups he used to scale the buildings.
- Dr. Jekyll said that his great-grandfather was the first Dr. Jekyll; this would make him Dr. Jekyll IV. However, in the Game Boy Color version of Scooby-Doo! Classic Creep Capers he says it was his father.