Live-action cast • Josef Ostendorf as Mr. Lou Dollart •
Danny Wells voices Mr. Lou Dollart in the English version. •
Beverly D'Angelo as Mrs. Dollart •
Jerry Stiller as Prof. Plumpingham •
Lauren Hutton as Evelyn Jellybelly • Jonathan Kinsler as Architect Stressback •
Steffen Wink as Assistant Nick McRafferty • Scott Weil voices Assistant Nick McRafferty in the English version. • Andreas Herder as Assistant Tom O'Dooley • Nicholas Benson voices Assistant Tom O'Dooley in the English version. •
Jack Recknitz as Mr. Adams •
Natja Brunckhorst as Mrs. Lucy • Yoshinori Yamamoto as Futon San
German voice cast •
Philipp Moog as Monty Mad-Rat Jr. (Monty Spinnerratz) • Carmen Plate as Isabella Noble-Rat (Isabella Nobelratz) •
Klaus Havenstein as Old Monty (Monty Senior) •
Gudo Hoegel as Rudi Rake-Rat (Rudi Raffratz) • Donald Arthur as Jean-Paul Canalligator (Knaligator Charon)
German voice cast (English actors) Source: • Dagmar Heller as Mrs. Dollart • Friedrich Georg Beckhaus as Prof. Plumpingham • Oliver Feld as Tom O'Dolley
English voice cast •
Dee Bradley Baker as Monty Mad-Rat Jr. •
Lynsey Bartilson as Isabella Noble-Rat •
Raymond Guth as Old Monty •
Scott MacDonald as Rudi Rake-Rat • Donald Arthur as Jean-Paul Canalligator == Production ==