- Dr. John Dolittle as Bernard
- Grandpa Archer Dolittle as Evinrude
- Dr. Mark Weller as Luke
- Calloway as Rufus
- Lucky the Dog as Gramps
- Rodney the Guinea Pig as TV Announcer
- Lisa Dolittle as Miss Bianca
- Rat #1 as Nero
- Rat #2 as Brutus
- Skunk as Mr. Snoops
- and more
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