Merlin - Journey Beyond Sodor - Trackmaster Revolution

When Thomas travels to the Mainland, he befriends the experimental engines, Merlin, Theo and Lexi. Merlin sails through life, full of confidence, believing that he has the ability to become invisible. He promises to help Thomas find his way back to Sodor. Later, the experimental engines come to rescue Thomas and James when they are trapped in the Steelworks.