Jason Lee
Shoeshine / Underdog (voice)
Acting
Jim Belushi
Dan Unger
Acting
Patrick Warburton
Cad
Acting
John Slattery
Mayor
Acting
Peter Dinklage
Dr. Simon Barsinister
Acting
Brad Garrett
Riff Raff (voice)
Acting
Taylor Momsen
Molly
Acting
Amy Adams
Polly Purebred (voice)
Acting
Alex Neuberger
Jack Unger
Acting
Larry Vigus
Security Guard
Acting
Bates Wilder
Cop
Acting
Frank Ridley
Police Sergeant
Acting
Alexander 'Alex' Garde
Small Boy
Acting
Diana Shneider
Police Secretary
Acting
Samantha Bee
Principal
Acting
John Franchi
Observer
Acting
Ezra Buzzington
Referee
Acting
Jay Leno
Jay Leno
Acting
Susie Castillo
Diana Flores
Acting
Phil Morris
Supershep 1 (voice)
Acting
Michael Massee
Supershep 2 (voice)
Acting
Cam Clarke
Little Brown Dog / Supershep 3 (voice)
Acting
John DiMaggio
Bulldog / Supershep 4 (voice)
Acting
Danny Mastrogiorgio
Crazy Dog (voice)
Acting
Jess Harnell
Astronaut (voice)
Acting
Susan Garfield
Office Worker
Acting
Timothy Crowe
Police Chief
Acting