Calum Worthy
— Ratty
Brenda Fricker
— Joan Jones
Tom Conti
— Bob Jones
Ned Beatty
— Mudduck
Stephen Ouimette
— Wheedle
James Millard
— Prince Richard
Don McKellar
— Oliver Tapscrew
Karl Pruner
— Julian
Richard Graham
— Charlie
William Greenblatt
— Billy
Michael D'Ascenzo
— Hocus
Wayne Robson
— Eric
Sheila McCarthy
— Mrs. Tapscrew
Graham Harley
— Professor Jeremy Knowall
Kathryn Greenwood
— Lucasta Utensil
Katie Blake
— Lady Aurelia Ashington / Mary Jane Potts
Michael Cera
— Buzzer