Klatu, Lek, And Ploo finally have a day off from their job as extras on a hit sci-fi TV show. So what should they do around Los Angeles for a day? Go to Dizzyland, of course! The amusement park has everything, from roller-coasters to ferris wheels to funhouses. It even has a small zoo. But when Klatu, Lek, and Ploo look through the zoo, they are shocked to find a fuzzy baby alien, named Mu, all locked up. They have to set Mu free!