This feature-length adventure heats up when the Island of Sodor nearly goes up in flames, forcing firefighting engines Flynn and Belle into action along with Sodor regulars Thomas and Percy. Feeling left out when Thomas begins to spend time with the two new heroes, Percy joins up with the mischievous Diesel 10, who, unbeknownst to Percy, wants the Diesels to take over Sodor Steamworks. Before long, Percy and the Steam Team must race against time to save the Steamworks before the Diesels can make it their new home.