- Bart as Dexter
- Lisa as Dee Dee
- Homer as Dexter's Dad
- Marge as Dexter's Mom
- Grandpa Abe as Dexter's Grandpa
- Mr. Burns as Mandark
- Maggie as Lee Lee
- Maude Flanders as Mee Mee
- Milhouse as Dexter's Monkey
- Slideshow Bob as Mandark's Duck
- Ned Flanders as Major Glory
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