Jason Lee
Shoeshine / Underdog (voice)
Peter Dinklage
Dr. Simon Barsinister
Amy Adams
Polly Purebred (voice)
Brad Garrett
Riff Raff (voice)
Timothy Crowe
Police Chief
Larry Vigus
Security Guard
Mario Mariani
Police Officer
Alexander 'Alex' Garde
Small Boy
Christopher Francis Byrnes
Mailman (as Christopher Byrnes)
Joe Siriani
News Stand Guy (as Joseph Siriani)
Michele Proude
Office Worker #2
Albert M. Chan
Geek Worker
Susie Castillo
Diana Flores
Bruce-Robert Serafin
City Worker (as Bruce Serafin)
Anthony Estrella
Male School Teacher (as Tony Estrella)
Malik McMullen
Bomb Squad Officer
Lewis D. Wheeler
Geek with Glasses
Ellen Withrow
Female Teacher
Frank Ridley
Police Sergeant
Courtney O'Reagan
College Girl
Rebekah Aramini
Fox Collar Lady
Richney Fischer
Baseball Dad
Joe Stapleton
Cat Burglar Police #1
Armen Garo
Cat Burglar Police #2
Daniel Kirby
News Director
Stephen James Kidd
Bomb Squad Member (as Steve Kidd)
Diana Shneider
Police Secretary
Bob Boehm
Bomb Squad Officer #2 (as Robert Boehm)
Lincoln P. Sisson
Bomb Squad Officer #3
Harry L. Thomas
Police Artist
Nicole Kopka
Jogger in Park
Adam McCarthy
Capitol City Security
Roy Souza
Capitol City Cop
Tom Paolino
Capitol City Cop
Scott Dittman
Hot Dog Contestant
Chris Andrew Ciulla
Fireman (as Chris Ciulla)
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)
John Franchi
Observer (uncredited)
Susan Garfield
Office Worker (uncredited)
Michael Tyler Henry
Jack Unger (voice)
