In most languages, some of the characters have the exact same voices as the characters in the original series:
- Brazilian: Jude is Topher.
- Canadian French: Jude is Don.
- English: Harold is Chet, Noah is Mike, and Jude is Chris.
- Additionally, several voice actors from the original series and Ridonculous Race appear as different characters:
- Mickey/Jay is Duncan's dad in "Bananas and Cheese" and Chinchilli Chinchilla in "Cartoon Realism".
- Miles/Mary is Duncan's mom in "Bananas and Cheese" and Beth's mom in "Baby Brother Blues".
- Don is Colonel McColonelson in "Inglorious Toddlers" and Flakey the Snowman in "Snow Country for Old Men".
- Emma/Crimson is Fire Chief Blaze in "All Up in Your Drill".
- Josee/Kelly is Flo in "Duncan Disorderly", Maude in "Robo Teacher", Courtney’s Mom in "Stingin’ in the Rain", The Chicken Queen in "The A-Bok-Bok-Bokalypse", and Estelle in "Broken Back Kotter".
- Stephanie is Abigail Paine in "Exercising the Demons".
- Pete is Floppo the Clown in "He Who Wears the Clown".
- Lindsay/Katie/Kitty is Brightly in "Cartoon Realism".
- Additionally, several voice actors from the original series and Ridonculous Race appear as different characters:
- French: Cody is Mike.
- Hebrew: The only voice recycling in the Hebrew dub are: Owen as Lightning; Jude as Dwayne Sr.; and Gwen as Amy and Kitty.
- Hungarian: The only characters to use recycled voice actors are: Noah as Dwayne Jr.; Jude as Noah (in the original series); Gwen as Izzy (in the original series) and Taylor; Courtney as Kitty; Beth as Katie; and MacArthur as Emma.
- Italian: Bridgette is Lindsay (All-Stars), and Jude is Lorenzo.
- Russian: Gwen is Josee; Jude is Junior;
- Spanish: Chef Hatchet is now Brick; Duncan is Lightning; Jude is Chet; Bridgette is Kitty; Gwen (as of season 2) is Sky; Beth is Amy, Samey, Crimson, and Ellody; and Don is Devin and Beardo.
