Underdog

Jason Lee

Shoeshine / Underdog (voice)

Peter Dinklage

Dr. Simon Barsinister

Jim Belushi

Dan Unger

Patrick Warburton

Cad

Alex Neuberger

Jack Unger

Taylor Momsen

Molly

John Slattery

Mayor

Amy Adams

Polly Purebred (voice)

Brad Garrett

Riff Raff (voice)

Samantha Bee

Principal

Timothy Crowe

Police Chief

Larry Vigus

Security Guard

Mario Mariani

Police Officer

Bates Wilder

Cop

Alexander 'Alex' Garde

Small Boy

Christopher Francis Byrnes

Mailman (as Christopher Byrnes)

Joe Siriani

News Stand Guy (as Joseph Siriani)

Sujoy De

Office Worker #1

Michele Proude

Office Worker #2

Albert M. Chan

Geek Worker

Jon Pierce

Hot Dog Vendor

Susie Castillo

Diana Flores

Bob Jaffe

Professor

Bruce-Robert Serafin

City Worker (as Bruce Serafin)

Lonnie Farmer

Passerby

Anthony Estrella

Male School Teacher (as Tony Estrella)

Malik McMullen

Bomb Squad Officer

Aaron Dorsey

Little Boy

Walter Covell

Old Man

Kate Lohman

Housewife

Lewis D. Wheeler

Geek with Glasses

Ellen Withrow

Female Teacher

John M. Deluca

Newscaster

Frank Ridley

Police Sergeant

Grady Justice

College Guy

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)

Rena Maliszewski

Mother

Diana Shneider

Police Secretary

Barry Blair

SWAT Captain

Bob Boehm

Bomb Squad Officer #2 (as Robert Boehm)

Lincoln P. Sisson

Bomb Squad Officer #3

Gabriel Field

Lyle

Harry L. Thomas

Police Artist

Amy Tanner

Kissing Girl

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

Ezra Buzzington

Referee

Chris Andrew Ciulla

Fireman (as Chris Ciulla)

Jay Leno

Jay Leno

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)

Joe Bucaro III

Goon #1

Stuart F. Wilson

Goon #2

John Franchi

Observer (uncredited)

Susan Garfield

Office Worker (uncredited)

Michael Tyler Henry

Jack Unger (voice)