Nicolas Cage character Dr. Tenma (voice)
Madeline Carroll character Widget (voice)
Freddie Highmore character Astro Boy (voice)
Kristen Bell character Cora (voice)
Donald Sutherland character General Stone (voice)
Bill Nighy character Dr. Elefun (voice)
Eugene Levy character Orrin (voice)
Sterling Beaumon character Sludge (voice)
Nathan Lane character Ham Egg (voice)
Samuel L. Jackson character Zog (voice)
Charlize Theron character Narrator
David Alan Grier character Mr. Squirt / Math Cowboy / Boxer Robot
Alan Tudyk character Mr. Squeegee / Scrapheap Head / Stinger Two
Newell Alexander character General Heckler (voice)
Elle Fanning character Grace (voice)
Pilar Flynn character Cora's Mom (voice)
Dee Bradley Baker character Trashcan (voice)
Moisés Arias character Zane (voice)
Ryan Stiles character Mr. Moustachio/Burning Robot (voice)
Matt Lucas character Sparx (voice)
