Jason Lee
Shoeshine / Underdog (voice)
Peter Dinklage
Dr. Simon Barsinister
Brad Garrett
Riff Raff (voice)
Amy Adams
Polly Purebred (voice)
Larry Vigus
Security Guard
Frank Ridley
Police Sergeant
Alexander 'Alex' Garde
Small Boy
Diana Shneider
Police Secretary
Susie Castillo
Diana Flores
Phil Morris
Supershep 1 (voice)
Michael Massee
Supershep 2 (voice)
Cam Clarke
Little Brown Dog / Supershep 3 (voice)
John DiMaggio
Bulldog / Supershep 4 (voice)
Danny Mastrogiorgio
Crazy Dog (voice)
Jess Harnell
Astronaut (voice)
Susan Garfield
Office Worker
Timothy Crowe
Police Chief
