- Dawson Cole as Dexter
- Young Dawson as Dexter's Monkey
- Amanda Collier as Dee Dee
- Young Amanda as Mee Mee
- Frank Reynolds as Mr. Luzinski
- Gerald McRaney as Action Hank
- Harvey Collier as Dexter's Grandpa
- Caroline Goodall as Dexter's Mom
- Jared as Dexter's Dad
- Older April as Agent Honeydew
- Ted Cole as Mandark
- Abee Cole as Mandark's Duck
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