Two children, Sally and Conrad, are left at home alone on a rainy day. They are visited by a cat wearing a red and white striped hat and a red bowtie. He performs all sorts of tricks. He balances a cup, a cake, an umbrella, and other things while standing on a ball. The Cat gets a box from outside. Inside are two creatures named Thing One and Thing Two. The Things begin to fly kites in the house. The children catch the Things with a net. The house is a mess. The Cat cleans it up. He leaves just before the mother comes home.