Special Guest Stars George Takei voices George Takei's Head Rich Little voices Rich Little's Head as Howard Cosell Gary Gygax voices Himself Guest Stars Frank Welker voices Nibbler Kath Soucie voices Cubert Farnsworth Frank Welker voices Tyrannosaurus Rex Frank Welker voices Trolls Frank Welker voices Monkey Frank Welker voices Polar Bear Frank Welker voices Rat Frank Welker voices Chickens Frank Welker voices Tunneling Horror Kath Soucie voices Indian Boy