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“You're our very own legendary adventurer, Thomas!”

Mines of Mystery is the third and final double-length episode of the twenty-third series.


Thomas wants to impress his friends by finding an amazing discovery. It is not long before his wish is granted, although not in the way he had expected.




UK and AUS


  • Joseph May as Thomas
  • Anna Francolini as Gina, the Children and the Passengers
  • Vincenzo Nicoli as Lorenzo, Beppe and a Worker
  • David Menkin as Jack
  • Tom Stourton as Alfie
  • Tim Whitnall as Oliver
  • Kerry Shale as Max
  • Rob Rackstraw as Monty
  • Teresa Gallagher as Brenda
  • Antonio Magro as Stefano


  • Production-wise, this episode and its predecessor, All Tracks Lead to Rome, as the two specials that form a two-part story, are placed in the exact middle of the regular-length episodes of the twenty-third series, between Thomas Makes a Mistake (the tenth episode production-wise) and Grudge Match (the eleventh episode production-wise).
  • Stock footage of All Tracks Lead to Rome is used.
  • Jack mentions the events of Sodor's Legend of the Lost Treasure.
  • A brief instrumental of The Work Song is heard when Thomas and Gina travel to the dig site with the Sodor Construction Company.
  • The fantasy sequence is a parody of Indiana Jones and the Raiders of the Lost Ark.
  • This is the first episode where other Sudrian vehicles join Thomas in an international location. Wish You Were Here is the first instance, but only in a fantasy sequence. This is the second time that Sudrian characters have joined Thomas. The first time was Really Useful Around the World: Thomas makes Scary Faces in New Zealand.
  • Kevin may have been planned to appear in this episode, as he was featured in multiple pieces of merchandise under the Digs and Discoveries banner. However, he did not make an appearance in any of the episodes featuring Italy or the Sodor Construction Company in the twenty-third series, possibly due to his role being cut at the last minute. Therefore, his only appearance in this series was Gordon Gets the Giggles.
  • This episode marks the first of a few things:
    • The first appearance of Brenda.
    • The first appearances of Lorenzo and Beppe outside of their fantasy appearances in the previous episode.
    • The first time since the Pack miniseries to even indirectly mention any currently absent pack members; in this case, it's Byron.
    • Jack and Oliver's first speaking roles since the twentieth series episode, Mucking About, as well as Alfie's first appearance since then, and the first time he is voiced by Tom Stourton after the departure of Nathan Clarke.
    • The first time since the nineteenth series episode, Who's Geoffrey? to feature a vehicle character with a green face.
  • This episode along with the previous marks the only two to feature Andrew Brenner as head writer.


  • When Thomas was talking to the Sodor Construction Company, Gina was derailed.
  • When Lorenzo's fire is being stoked up, the cab interior shown is actually Gordon's.
  • When Jack says "I like the sound of this story!" while inside Stefano, only his face moves while his body remains stationary.
  • When Thomas was pulling Lorenzo and Beppe out of the Old Mines, Lorenzo was clean, but seconds later, he was dirty again.
  • When Thomas brakes in the old mine, the squealing sound effect plays before his wheels stop moving.
  • Montserrat Lombard is credited despite not voicing any characters in the episode.
  • In one scene, Alfie's conflat and Oliver's low-loader clip into each other.
  • When Thomas and Gina take the Pack to the dig site, Max and Monty keep switching places as they roll along the road.
  • Max has Monty's horn sound when Thomas almost runs into him.

In Other Languages

Language Title
Brazilian Portuguese Minas do Mistério!
Dutch De Mysterieuze Mijnen
Finnish Mysteerin Kaivokset
German Das geheimnisvolle Bergwerk
Korean 광산의 수수께끼
Polish Tajemnicze Kopalnie
Russian Загадочная шахта
Spanish Las Minas del Misterio

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