- Sonic as Inspector Gadget
- Cream as Penny
- Tails as Brain
- Dr. Robotnik as Dr. Claw
- Big as MAD Cat
- Mario (from Super Mario Bros.) as Chief Quimby
- Don Adams as Sonic
- Cree Summer as Cream
- Frank Welker as Tails, Dr. Robotnik and Big
- Dan Hennessey as Mario
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