Joe Sichta Director, Writer, Producer Frank Welker Scooby Doo Voice Casey Kasem Shaggy Voice Grey DeLisle Daphne Blake Voice Mindy Cohn Velma Voice Tim Curry The Goblin King Voice Hayden Panettiere Fairy Princess Willow Voice Wayne Knight The Amazing Krudsky Voice Wallace Shawn Mr. Gibbles Voice Jim Belushi Glob Voice Larry Joe Campbell Glum Voice Lauren Bacall The Grand Witch Voice Jay Leno Jack O'Lantern Voice Russi Taylor Owl Witch , Tiddlywink Voice