• Otis as Astro Boy
  • Dag as Dr. Stone
  • Pip as Robotsky
  • Pig as Dr. Tenma
  • Ben as Orrin
  • Daisy as Astro's Mom
  • Duke as Astro's Dad
  • Freddy as Eggham
  • Miles as Trashcan
  • Bessy as Cora
  • Eddy, Igg, and Bud as Dr. Stone's Guy, Mike, and Sparx
  • Everett as Teacher
  • Etta as Widget
  • Peck as Sludge
  • Maddy as Grace
  • Root as Robot
  • Snotty Boy as Zane
  • Mr. Beady as Jump
  • Pizza Twin #1 as ZOG
  • Pizza Twin #2 as Dr. Elefun
  • Mrs. Beady as Uran
  • Officer O' Hanlon as Ham Egg

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