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“This is my first time on the Island of Sonar, my friend Thomas works here."
"Do you mean Sodor?”
―Merlin and Cranky

Seeing is Believing is the thirteenth episode of the twenty-second series.


Merlin comes to Sodor from the Mainland for the first time. He thinks that when he shuts his eyes, nobody can see him. Percy hears everyone talking about the 'invisible' engine and wonders why he has not seen him.



Voice cast



  • Joseph May as Thomas
  • Kerry Shale as Gordon
  • Rob Rackstraw as James
  • Christopher Ragland as Percy and Trevor
  • Jules de Jongh as Emily
  • Hugh Bonneville as Merlin
  • Yvonne Grundy as Nia
  • Rachael Miller as Rebecca
  • Keith Wickham as Salty
  • Teresa Gallagher as Annie and Clarabel
  • Glenn Wrage as Cranky
  • Lucy Montgomery as Carly
  • Nigel Pilkington as Merlin in Percy's fantasy (uncredited)


  • This episode marks Merlin’s first appearance since Journey Beyond Sodor and his first full appearance in an episode.
  • Trevor uses Vinnie's whistle sound in this episode. This also marks his only speaking role in the twenty-second series.
  • At the beginning of the Latin American Spanish version, stock footage from Forever and Ever is used.


  • Nigel Pilkington was not credited for voicing Merlin in Percy's fantasy scene in the US dub.

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In Other Languages

Language Title
Brazilian Portuguese Ver Para Crer
Dutch Ik Geloof het Pas als ik het Zie
German Alles nur Einbildung
Hebrew לראות כדי להאמין
Japanese みえないきかんしゃマーリン
Polish Uwierzę, gdy zobaczę
Spanish Ver es Creer


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