- Emily the Beautiful Engine as Ariel
- James the Red Engine as Prince Eric
- Thomas the Tank Engine as Flounder
- Toby the Tram Engine as Sebastian
- Gordon the Big Engine as King Triton
- Duck the Great Western Engine as Scuttle
- Edward the Blue Engine as Grimsby
- Daisy the Diesel Rail-car as Ursula
- 'Arry & Bert the Smelter Diesels as Flotsam and Jetsam
- Mavis the Quarry Diesel as Vanessa
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