Underdog

Jason Lee

as

Shoeshine / Un...

Jim Belushi

as

Dan Unger

Patrick Warbur...

as

Cad

John Slattery

as

Mayor

Peter Dinklage

as

Dr. Simon Bars...

Brad Garrett

as

Riff Raff (voi...

Taylor Momsen

as

Molly

Amy Adams

as

Polly Purebred...

Alex Neuberger

as

Jack Unger

Larry Vigus

as

Security Guard

Bates Wilder

as

Cop

Frank Ridley

as

Police Sergeant

Alexander 'Ale...

as

Small Boy

Diana Shneider

as

Police Secreta...

Samantha Bee

as

Principal

John Franchi

as

Observer

Ezra Buzzington

as

Referee

Jay Leno

as

Jay Leno

Susie Castillo

as

Diana Flores

Phil Morris

as

Supershep 1 (v...

Michael Massee

as

Supershep 2 (v...

Cam Clarke

as

Little Brown D...

John DiMaggio

as

Bulldog / Supe...

Danny Mastrogi...

as

Crazy Dog (voi...

Jess Harnell

as

Astronaut (voi...

Susan Garfield

as

Office Worker

Timothy Crowe

as

Police Chief