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.

Bonus features: 4 sing-a-long songs; landmarks of Sodor; top 5 funniest moments!