- Mr. Peabody as Thomas
- Sherman as Percy
- Horton (from Horton Hears a Who) as Edward
- George (from George of the Jungle) as Henry
- Moe (from The Simpsons) as Gordon
- Homer Simpson (from The Simpsons) as James
- Jewel (from Rio) as Emily
- Penny Peterson as Rosie
- Paul Peterson as Diesel
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