- Owen Chase as Astro Boy
- Herman Melville as Mike
- Kyle (from Dolphin Tale) as Robotsky
- Alexander (from Journey 2: The Mysterious Island) as Sparx
- Matthew Joy as Zane
- Captain George Pollard, Jr. as Sludge
- Gabato (from Journey 2: The Mysterious Island) as Teacher
- Old Thomas Nickerson as Dr. Elefun
- Mrs. Nickerson as Cora
- Paul Macy as Dr. Stone
- Lizard (from Journey 2: The Mysterious Island) as Dr. Stone's Guy
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