The Steamies and the Diesels face off in this action-packed movie adventure! When a fire breaks out on the Island of Sodor, two new firefighting engines -- Flynn and Belle -- join Thomas and Percy to save the day! When Thomas starts spending all his time with Sodor's newest heroes, Percy is left feeling alone. Diesel sees this and invites Percy to the Dieselworks, where Percy is made to feel special by none other than the master of mischief Diesel 10! But Percy doesn't know that he is part of Diesel 10's master plan to take over the Sodor Steamworks. Can Percy lead the Steam Team to reclaim the Steamworks or will the Diesels make it their new home? It's full steam ahead to sure-fire excitement in this all-new movie from Thomas & Friends™!