Sci-Fi martial arts action!After years of training and adventure, Goku has become Earths ultimate warrior. And his son, Gohan, shows even greater promise. But the stakes are increasing as even deadlier enemies threaten the planet. DRAGON BALL Z is the ultimate science fiction-martial arts manga. Son Goku is the greatest hero on Earth. Five years after defeating the demon king Piccolo, hes grown up and had a familyhes married, and he has a child, Son Gohan. But what is the real reason for Gokus incredible strength? A visitor from outer space arrives bearing terrible newsGoku is an alien, and the visitor, Raditz, is Gokus brother! When Raditz turns out to be a ruthless killer, Goku must fight his incredibly strong brother to save his family and the entire human race. A surprising alliance may be Earths last hope: Goku will team up with his old enemy Piccolo...archenemies united to save the world!