Special Guest Stars Maurice LaMarche voices Vincent Price Susan Egan voices 'You'll Never Sleep Again' Singer Tree Rollins voices Himself Guest Stars Pamela Hayden voices Milhouse Van Houten Grey DeLisle Griffin voices Martin Prince Maggie Roswell voices Luanne Van Houten Grey DeLisle Griffin voices Sherri Grey DeLisle Griffin voices Terri Tress MacNeille voices Crazy Cat Lady Chris Edgerly voices Laughing Crowd Tress MacNeille voices Greta Wolfcastle Alex Désert voices Audrey II Tress MacNeille voices Mopey Mary Kevin Michael Richardson voices Groot