Heroes is the twenty-fourth episode ever made in Season 3.
Bill and Ben are bored at the China Clay Workings and are delighted to be asked to work at the harbour for the day, but they unwisely ask the trucks for advice. As a result, the yard gets in a mess, causing Gordon to be late with the Express. The next day at the Workings, a rockslide devastates the quarry, but Bill and Ben get all the workmen out just in time. The next day, the Fat Controller arrives on board Edward and praises the twins for saving the day.
- In the second shot of Bill and Ben shunting trucks at the harbour, a truck with half a load of coal is visible. When the twins shunt this truck the load lifts, revealing it to be a wooden prop made to look like coal.