The story begins as a girl named Sally (Lauren Hegge) and her unnamed brother (Josh Kaiser), who serves as the narrator of the book (Dylan Thornen), sit alone in their house on a cold, rainy day, staring wistfully out the window. Then they hear a loud bump which is quickly followed by the arrival of the Cat in the Hat (Elizabeth Arihood), a tall anthropomorphic cat in a red- and white-striped hat and a red bow tie. The Cat proposes to entertain the children with some tricks that he knows. The children's pet fish (Ryan Stotts) refuses, insisting that the Cat leave. The Cat responds by balancing the fish on the tip of his umbrella. The game quickly becomes more complicated, as the Cat balances himself on a ball and tries to balance lots of household items on his limbs until he falls on his head, dropping everything he was holding. The fish admonishes him again, but the Cat in the Hat just proposes another game.
The Cat brings in a big red box from outside, from which he releases two identical creatures with blue hair and red suits called Thing One (Kieran Harnish) and Thing Two (Allison Stotts). The Things cause more trouble, such as flying kites in the house, knocking pictures off the wall and picking up the children's mother's new polka-dotted gown. All this comes to an end when the fish spots the children's mother out the window. In response, Sally's brother catches the Things in a net, and the Cat, apparently ashamed, stores them back in the big red box. He takes it out the front door as the fish and the children survey the mess he has made. But the Cat soon returns, riding a machine that picks everything up and cleans the house, delighting the fish and the children. The Cat leaves just before their mother arrives, and the fish and the children are back where they started at the beginning of the story. As she steps in, the mother asks the children what they did while she was out, but the children are hesitant and do not answer. The story ends with the question, "What would you do if your mother asked you?"