Rosie is kidnapped by Diesel 10 and his evil army, so Thomas, Percy, Gordon, Henry, James, Toby, Edward, Emily and the other railroad engines, especially Mavis must set on out to Rosie's rescue, overcoming every obstacle Diesel 10 throws at them . When Rosie's rescued, Merlin, Hurricane, Frankie, Lexi and Theo are there to celebrate the Brave Engine Heroes victory.
