Flynn is the Sodor Island fire engine and his wheels have been adapted so that he can roll on the road as well as on the train tracks. As he sets out on the road, he is nervous and his wheels wobble. Charlie chuffs by and makes fun of him leaving Flynn feeling silly. Rocky then tells Flynn that Sir Topham Hatt's shed is on fire. Flynn drives off, but instead of using the road which would be faster, he goes on the tracks so he will not be a "big red wobble on wheels".
