Thomas journeys off the Island of Sodor in this all-new adventure! The engines are hard at work to build a new Search and Rescue Centre. When Thomas helps a friend in need, he is rewarded with an exciting trip to the mainland. Along the way, he gets lost at sea and finds himself on the mysterious Misty Island, where he meets new friends Bash, Dash, and Ferdinand. Together they discover secret hideouts and try to help Thomas find his way home. Will The Fat Controller's search party ever find Thomas?