Astro Boy/Toby

Freddie Highmore

Dr. Tenma (voice)

Nicolas Cage

Atom

Yoo Seung-ho

Widget (voice)

Madeline Carroll

Cora (voice)

Kristen Bell

Dr. Tenma

Jo Min-ki

Ham Egg

Nathan Lane

Cora

Nam Ji-hyun

Peace Keeper

Yoo Se-yoon

Orrin

Eugene Levy

Dr. Elefun

Yoo Hae-mu

President Stone (voice)

Donald Sutherland

Sparx (voice)

Matt Lucas

Orrin

Yoon Se-woong

Dr. Elefun / Robotsky (voice)

Bill Nighy

Sludge

Sterling Beaumon

"Our Friends" Narrator

Charlize Theron

Zog

Samuel L. Jackson

Mr. Moustachio / Burning Robot (voice)

Ryan Stiles

Mr. Squirt / Math Cowboy / Boxer Robot

David Alan Grier

Mr. Squeegee / Scrapheap Head / Stinger Two (voice)

Alan Tudyk

Grace

Elle Fanning

Trashcan

Dee Bradley Baker

General Heckler (voice)

Newell Alexander

Stinger One

Bob Logan

Zane

Moisés Arias

Cora's Mom (voice)

Pilar Flynn

Mike the Fridge

David Bowers

The Little Stinker (voice)

Sofia Bowers

"Oh No!" Kid (voice)

Nicole Fletcher

Dr. Pigknuckle / Newscaster (voice)

Maryann Garger

Bride to Be (voice)

Tiffany Hillkurtz

Cowboy Robot (voice)

David Feiss

French Waiter Robot (voice)

Nicholas Guest

Billy (voice)

Max Burkholder

Sam (voice)

Victor Bonavida

Press Secretary (voice)

Steve Alterman

Metro City Sergeant (voice)

Rif Hutton

Metro City Girl (voice)

Madeleine Russell

Cora's Dad (voice)

Tony Matthews

Sludge

Sterling Beaumont