"A lab accident gives a beagle named Shoeshine some serious superpowers -- a secret that the dog eventually shares with the young boy who becomes his owner and friend."
Jason Lee
as Shoeshine / Underdog (voice)
Peter Dinklage
as Dr. Simon Barsinister
Jim Belushi
as Dan Unger
Patrick Warburton
as Cad
Alex Neuberger
as Jack Unger
Taylor Momsen
as Molly
John Slattery
as Mayor
Amy Adams
as Polly Purebred (voice)
Brad Garrett
as Riff Raff (voice)
Samantha Bee
as Principal
Timothy Crowe
as Police Chief
Larry Vigus
as Security Guard
Mario Mariani
as Police Officer
Bates Wilder
as Cop
Alexander 'Alex' Garde
as Small Boy
Christopher Francis Byrnes
as Mailman (as Christopher Byrnes)
Joe Siriani
as News Stand Guy (as Joseph Siriani)
Sujoy De
as Office Worker #1
Michele Proude
as Office Worker #2
Albert M. Chan
as Geek Worker
Jon Pierce
as Hot Dog Vendor
Susie Castillo
as Diana Flores
Bob Jaffe
as Professor
Bruce-Robert Serafin
as City Worker (as Bruce Serafin)
Lonnie Farmer
as Passerby
Anthony Estrella
as Male School Teacher (as Tony Estrella)
Malik McMullen
as Bomb Squad Officer
Aaron Dorsey
as Little Boy
Walter Covell
as Old Man
Kate Lohman
as Housewife
Lewis D. Wheeler
as Geek with Glasses
Ellen Withrow
as Female Teacher
John M. Deluca
as Newscaster
Frank Ridley
as Police Sergeant
Grady Justice
as College Guy
Courtney O'Reagan
as College Girl
Rebekah Aramini
as Fox Collar Lady
Richney Fischer
as Baseball Dad
Joe Stapleton
as Cat Burglar Police #1
Armen Garo
as Cat Burglar Police #2
Daniel Kirby
as News Director
Stephen James Kidd
as Bomb Squad Member (as Steve Kidd)
Rena Maliszewski
as Mother
Diana Shneider
as Police Secretary
Barry Blair
as SWAT Captain
Bob Boehm
as Bomb Squad Officer #2 (as Robert Boehm)
Lincoln P. Sisson
as Bomb Squad Officer #3
Gabriel Field
as Lyle
Harry L. Thomas
as Police Artist
Amy Tanner
as Kissing Girl
Nicole Kopka
as Jogger in Park
Adam McCarthy
as Capitol City Security
Roy Souza
as Capitol City Cop
Tom Paolino
Scott Dittman
as Hot Dog Contestant
Ezra Buzzington
as Referee
Chris Andrew Ciulla
as Fireman (as Chris Ciulla)
Jay Leno
as Jay Leno
Phil Morris
as Supershep 1 (voice)
Michael Massee
as Supershep 2 (voice)
Cam Clarke
as Little Brown Dog / Supershep 3 (voice)
John DiMaggio
as Bulldog / Supershep 4 (voice)
Danny Mastrogiorgio
as Crazy Dog (voice)
Jess Harnell
as Astronaut (voice)
Joe Bucaro III
as Goon #1
Stuart F. Wilson
as Goon #2
John Franchi
as Observer (uncredited)
Susan Garfield
as Office Worker (uncredited)
Michael Tyler Henry
as Jack Unger (voice)
Gary Barber
Producer
Joe Piscatella
Screenplay
Randy Edelman
Original Music Composer
Adam Rifkin
Novel
Craig A. Williams
David Eggby
Director of Photography
Frederik Du Chau
Director
Roger Birnbaum
Jonathan Glickman
Charles Martin Inouye
Supervising Music Editor
Andy Fowler
Visual Effects Producer
Ellen M. Hillers
Second Assistant Director
Robert L. Sephton
Sound Designer
Paul J. Lombardi
Special Effects Coordinator
Story
Eric Ellenbogen
Executive Producer
Bob Higgins
Erin Stam
Co-Producer
Supervising Sound Editor
Donna E. Bloom
Unit Production Manager
Hoyt Yeatman
Visual Effects Supervisor
Gail Goldberg
Casting Director
Peggy Nicholson
Hair Department Head
Montez A. Monroe
Production Coordinator
Tanya Noel Hill
Music Editor
Rebekah Rudd
Todd Arnow
Kelly Cronin
Script Supervisor
Mark Dornfeld
Philip A. Patterson
First Assistant Director
Boone Narr
Animal Coordinator
Rob Duncan
Bob Brown
Second Unit Director
Ben Shepherd
Gayle Busby
Lisa Shaftel
Scenic Artist
Stunts
Ian Mclaughlin
Joanne Lamstein
Caroline Vexler
Jon H. Epstein
Stunt Coordinator
Jimmy P. Wong
Aaron Vexler
Kimberly Shannon Murphy
Shawn Kautz
Joe Rossi
Makeup Department Head
Jay Polstein
James F. Truesdale
Art Direction
Maggie Martin
Set Decoration
Tom Finan
Editor
Gary Jones
Costume Design
Garreth Stover
Production Design