In "Henry Rocks the Fourth" an amazing opportunity is presented to Billy and Henry, The Counting Rooster, the Mayor of San Francisco, California has extended an invitation to visit the city during the Fourth of July week. A new safari exhibit is about to be revealed at the San Francisco Zoo. Will Henry and the Counting farm animals survive in the big city? What will be their adventure, when they meet Zamboo and Termite, the zoo keepers? What does Henry and the rest of the farm animals teach? Most importantly what do they learn when they meet the exotic zoo animals and Bruno, the infamous blue rhino.