- Dooley as Dexter
- M.A.R.T.I.E. as Dexter's Monkey
- Cosmos and Zoom as Mitch and Clem
- Mom as Dee Dee
- Nick as Mr. Luzinski
- Maxx as Dexter's Mom
- Michael as Dexter's Dad
- Chris as Tall Dexter
- Kayla as Lee Lee
- Ashley as Mee Mee
- Ms. Z. as Agent Honeydew
- Dr. Arvid as Mayor Glory
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