Woody Harrelson
Arthur Poppington / Defendor
Kat Dennings
Katrina Debrofkowitz
Elias Koteas
Chuck Dooney
Sandra Oh
Dr. Park
Clark Johnson
Roger Fairbanks
Michael Kelly
Paul Carter
Kristin Booth
Wendy Carter
Lisa Ray
Dominique Ball
A.C. Peterson
Radovan Kristic
Tony Nappo
Biker Cliff
David Gardner
Grandpa Henry
Bryan Renfro
Mr. Debrofkowitz
Charlotte Sullivan
Poppington
Tatiana Maslany
Olga
Ron White
Judge Wilson
Graham Abbey
Constable Mike
Max Dreesen
Young Arthur
Matt Gordon
Jerry
James Preston Rogers
Biker Bob
Michael Cram
Blake
Lyriq Bent
Wayne
Peter Stebbings
Doctor
Dakota Goyo
Jack Carter - 9
John Paul Ruttan
Jack Carter - 4