Special Guest Stars Coolio voices Kwanzaabot Guest Stars Phil LaMarr voices Hermes Conrad Lauren Tom voices Amy Wong Frank Welker voices Nibbler David Herman voices Mayor Poopenmayer Frank Welker voices Walter Kronkite's Head Frank Welker voices Robo-Dogs Frank Welker voices Elves Frank Welker voices Hyperchicks David Herman voices Elves David Herman voices Father Phil LaMarr voices Bailiff