Sci-Fi martial arts action! After years of training and adventure Goku has become Earth s 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 he s grown up and had a family--he s married and he has a child Son Gohan. But what is the real reason for Goku s incredible strength? A visitor from outer space arrives bearing terrible news--Goku is an alien and the visitor Raditz is Goku s 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 Earth s last hope: Goku will team up with his old enemy Piccolo...archenemies united to save the world!