- Thomas as Hercules
- Gordon as Amphiaraus
- Toby as Cotys
- The Horrid Lorries as Cerebus
- Arry, Bert, Splatter, Dodge, Den, Dart, Max, and Monty as Hydras
- Bulgy as Erymanthian Boar
- Diesel 10 as Nemean Lion
- Trucks as Centaurs
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