Mister Rogers demonstrates an electric heater and remarks that it is sometimes difficult to tell when something is hot. He shows the heater for the fish tank and the room radiator. Mister Rogers goes to Brown’s Marionette Theater to see how it is heated. Bob Brown explains how his furnace works. The Browns have a show using X, Henrietta, and King Friday marionettes. Mister Rogers talks about different ways to make up stories. He says that he likes hand puppets and that he does the voices and movements of some of the puppets in the Neighborhood of Make-Believe. In the Neighborhood of Make-Believe, Henrietta Pussycat wants to be in the opera, but she is too shy to ask. X encourages Henrietta, and Reardon lets her sing a song.