Dr. Tenma (voice)

Widget (voice)

Astro Boy (voice)

Cora (voice)

General Stone (voice)

Dr. Elefun (voice)

Orrin (voice)

Sludge (voice)

Ham Egg (voice)

Zog (voice)

Narrator

Mr. Squirt / Math Cowboy / Boxer Robot

Mr. Squeegee / Scrapheap Head / Stinger Two

General Heckler (voice)

Grace (voice)

Cora's Mom (voice)

Trashcan (voice)

Zane (voice)

Mr. Moustachio/Burning Robot (voice)

Sparx (voice)

Mike the Fridge (voice)

The Little Stinker (voice)

Oh No! Kid (voice)

Dr. Pigknuckle / Newscaster (voice)

Bride to Be (voice)

Cowboy Robot (voice)

French Waiter Robot (voice)

Billy (voice)

Sam (voice)

Press Secretary (voice)

Metro City Sergeant (voice)

Metro City Girl (voice)

Cora's Dad (voice)