Traveling along the rails with his engine buddy, Huff, a little caboose named Puff clicks and clacks endlessly until the day that the friends decide to switch places, with unexpected results.
Delighted to be asked by Miss Bird to help during a little dancers' class, an exuberant Mia observes that the little ballerinas in her charge have difficulties performing steps, a challenge that prompts Mia to devise a clever solution.