- Emily as Taran
- Thomas as Princess Eilonwy (Princess Eilonwy's Voice Suits Thomas The Tank Engine)
- Flora as Dallben
- Belle as Fflewddur Fflam
- Rosie as Gurgi
- Mavis as King Eidilleg
- Isobella as Doli
- Oliver as Hen-Wen
- Molly, Lady, Caroline and Percy as The Fairfolk
- Salty, Duck and James as Orddu, Orwen and Orgoch
- Martha the Yellow Steamroller (A Fan-Made Female Thomas Character) as Creeper
- Pinknose the Big Engine (A Fan-Made Female Thomas Character) as The Horned King
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