Henry and Hiro take on some bad coal and start puffing out black smoke, but they do not notice until Duck informs them about it. Henry is worried and goes back to the sheds to wait for the new shipment of coal, but Hiro is determined to get his jobs done, regardless of the coal he's burning.

Whilst delivering some stone to Ulfstead Castle, Luke meets Sir Robert Norramby and Millie for the first time. Luke and Millie decide to swap jobs for the day to get a taste of what each other's everyday work is like.