Evil Fred was the disguise of Brad Chiles. His poor acting made it a very bad imitation.
He looks physically identical to Fred.
He was rude to everyone who was supposed to be his friends, insulting Daphne Blake, Velma Dinkley, Shaggy Rogers, and Scooby-Doo. He was also bad with names, called Shaggy "Norbert" instead of "Norville" (even the latter would have been a bad mistake, since Shaggy only goes by his nickname).
Scooby-Doo! Mystery Incorporated
He used plastic surgery (along with his wife Judy) to impersonate Fred, while Judy tried to trick the real Fred by saying that the Planispheric Disk destroyed Crystal Cove by speeding up time turning everybody to skeletons. He used a radio to look for the Disk in the real Crystal Cove while Fred looked for it on a movie set made to look like the destroyed city.
- Old Daphne along with Evil Fred are the first disguises that didn't consist of masks.