- Owen as Stanley Yelnats
- Gray as Zero
- Zach as X-Ray
- Balto (from Balto) as Barfbag
- Vic Hoskins as Mr. Sir
- Mosy The Mosasaurus as The Warden
- Wilma (from The Filnstones Movie) as Kate Barlow
- Benji Appebaum (from Pitch Perfect) as Squid
- Scott as Caveman
- Barry as Stanley's Grandpa
- Claire as Stanley's Mom
- Lowery as Stanley's Grandpa
- Indominus Rex as The Lizard
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