- Mario as Thomas
- Donkey Kong as Gordon
- Rabbit as James
- Yoshi as Percy
- The Mayor of Townsville as Sir Topham Hatt
- Diddy Kong as Henry (does not speak)
- Luigi as Duck (cameo)
- Plankton as Diesel (cameo)
- Sonic as Bertie (cameo)
- George Carlin as Narrator
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