Dragon Ball Z is a continuation of the Dragon Ball series about the adult life of Son Goku and his adventures defending Earth from powerful villains, ranging from aliens and androids to magical creatures. The show focuses on Goku, his allies (the Z-Fighters), and the ongoing rivalry between Goku and Vegeta, as they face ever-increasing threats. The plot is driven by high-stakes, action-packed battles where characters continually push their limits and get stronger.