When boy genius, Dexter makes experimental cookies, his sister, Dee Dee eats one and turns into a giant.
| Actor | Role |
|---|---|
 Christine CavanaughDexter (voice) | Dexter (voice) |
 Kath SoucieMom / Ms. Physics (voice) | Mom / Ms. Physics (voice) |
 Jeff BennettProfessor / Cop / Anchor Man / Man #1 (voice) | Professor / Cop / Anchor Man / Man #1 (voice) |
 Frank WelkerPresident / General / Guy / Man #2 / Einstein (voice) | President / General / Guy / Man #2 / Einstein (voice) |
| AAllison MooreDee Dee (voice) | Dee Dee (voice) |