- Sid as Bolt
- Gabriela as Mittens
- Gerald as Rhino
- Susie as Penny
- May as Young Penny
- Alice as Penny's Mom
- Mort as Penny's Father
- Mr. Bleakman (from Clifford the Big Red Dog) as Dr. Calico
- Duck, Dog, and Frog (from WordWorld) as Pigeons
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