"Dragon Ball Z" continues the adventures of Son Goku, who, along with his companions, defends the Earth against villains ranging from aliens (Vegeta, Frieza), androids (Cell) and magical creatures (Majin Buu). While the original "Dragon Ball" anime followed Goku from childhood to early adulthood, "Dragon Ball Z" is a continuation of his adult life, but at the same time parallels the life of his son, Gohan, as well as the development of his rivals, Piccolo and Vegeta.