|What's missing, Scoobypedia?|
Dark Skull is the Wildwind disguise of Russell.
Dark Skull appeared as a ghost with a round face and two black circles around his eyes. He wears a purple costume with white stripes.
Scooby-Doo! And The Legend Of The Vampire
He and his band mates faked their disappearance a year ago because they lost the band competition. They disguised themselves as vampire versions of themselves to kidnap the bands that were competing.