- Olaf as The Boy
- Gru (from Despicable Me) as The Conductor
- Elsa as The Girl
- Young Kristoff as The Lonely Boy
- Gru (from Despicable Me) as Know-It-All Boy
- Horton (from Horton Hears a Who) as The Driver
- Anna and Elsa's Dad as The Firesman
- Kristoff as Father
- Anna as Mother
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