Joseph May

After discovering an old pirate ship, Thomas and his friends search for Sodor's lost treasure.

Determined to prove his importance on Sodor, Thomas takes James' trucks and sets off on a big adventure to the Mainland. On the way, he makes friends with the cheerful and helpful 'Experimental Engines' but, after a wrong turn, finds himself lost in the steelworks. There, Thomas encounters two mysterious engines who instantly make him feel welcome but who aren't what they first seem.