Freddie Highmore

Astro / Toby (voice)

Kristen Bell

Cora (voice)

Nathan Lane

Hamegg (voice)

Eugene Levy

Orrin (voice)

Matt Lucas

Sparx (voice)

Bill Nighy

Dr. Elefun (voice)

Donald Sutherland

President Stone (voice)

Charlize Theron

"Our Friends" Narrator (voice)

Nicolas Cage

Dr. Tenma (voice)

Madeline Carroll

Widget (voice)

Sterling Beaumon

Sludge (voice)

Samuel L. Jackson

Zog (voice)

David Alan Grier

Mr. Squirt / Math Cowboy / Boxer Robot

Alan Tudyk

Mr. Squeegee / Scrapheap Head / Stinger Two

Newell Alexander

General Heckler (voice)

Elle Fanning

Grace (voice)

Pilar Flynn

Cora's Mom (voice)

Dee Bradley Baker

Trashcan (voice)

Moisés Arias

Zane (voice)

Ryan Stiles

Mr. Moustachio / Burning Robot (voice)

David Bowers

Mike the Fridge (voice)

Sofia Bowers

The Little Stinker (voice)

Nicole Fletcher

"Oh No!" Kid (voice)

Maryann Garger

Dr. Pigknuckle / Newscaster (voice)

Tiffany Hillkurtz

Bride to Be (voice)

David Feiss

Cowboy Robot (voice)

Nicholas Guest

French Waiter Robot (voice)

Max Burkholder

Billy (voice)

Victor Bonavida

Sam (voice)

Steve Alterman

Press Secretary (voice)

Rif Hutton

Metro City Sergeant (voice)

Madeleine Russell

Metro City Girl (voice)

Tony Matthews

Cora's Dad (voice)