The cats of Oz, led by the mysterious and wicked black cat, Joom, are trying to take over all of Oz. Toto has disappeared and Dorothy is beside herself with worry. Impervious to the Wizard's magic, the cats have already conquered the Emerald City. Ozma and Glinda, making a last stand in Glinda's Ruby Palace, have called together all the friendly magic workers from all over, even some from beyond the Deadly Desert. But how can they stop the cats if they are impervious to magic? How can they save Toto and Oz?