Part 2 of the Dragonball madness, this story starts when Goku is an adult and introduces him to his Saiyan origin. The main theme of Dragonball Z is fighting although it still retains aspects of the humor and adventure from the previous Dragonball series. Characters develop as they grow, mature, and some even have children! Many of Goku's former enemies become his friend they band together to fight greater evils along the way.