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. While Goku races towards Earth along the million-kilometer Serpent Road, the world's mightiest martial artists make their last stand against alien invaders determined to wipe out the human race! Piccolo. Gohan, Kuririn, Tenshinhan and Chaozu struggle five-to-one against Nappa, only to find their opponents' power is greater than they ever dreamed. Their last chance is Goku...but can he get there in time? And is even he, and the miraculous Kaio-ken, a match for Nappa's commander Vegeta?