The world's greatest team 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 is 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 an ruthless killer, Goku must fight his incredibly strong brother to save his family and the entire human race.