- Mario as Thomas
- Yoshi as Percy
- Sonic as Bertie
- Owl as Harold
- The Mayor of Townsville as Sir Topham Hatt
- Blossom and Bubbles as Annie and Clarabel (non speaking role)
- Rabbit as James (cameo)
- Tails as Trevor (cameo)
- Pelipper as Butch (cameo)
- Taillow as Tiger Moth (cameo)
- Michael Brandon as Narrator
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