Magic Merlin is an upcoming episode.
Merlin gets magical and he is a magical invisible engine.
- Mr. Percival
- Thomas (narration only; end segment)
- Annie and Clarabel (end segment)
- Rosie (cameo)
- Belle (cameo)
- Connor (cameo)
- Caitlin (cameo)
- 'Arry and Bert (cameo)
- Butch (cameo)
- Paxton (stock footage)
- At the end of the episode, Thomas mentions the events from the eighteenth season episode, Disappearing Diesels, stock footage from the said episode is also used.
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