The age of the demons has begun. Dr Faust has foreseen this rise of evil. Unfortunately, he is near death and is unable to personally battle this upcoming threat. Faust entrusts a young boy, Shingo Yamada, to take the responsibility of ridding the Earth of this new evil presence. Faust finds a birthmark on Shingo's forehead that signifies that he is the chosen demon fighter. Faust summons from hell what may be humanity's only hope of surviving: a less than enthusiastic devil named Mephisto rises. After signing a pact in blood to save humankind, Shingo and Mephisto set out to battle the supernatural world. (Source: AniDB)

Five years after winning the World Martial Arts tournament, Gokuu is now living a peaceful life with his wife and son. This changes, however, with the arrival of a mysterious enemy named Raditz who presents himself as Gokuu's long-lost brother. He reveals that Gokuu is a descendant of the once powerful but now virtually extinct Saiyan race, whose homeworld was annihilated. When he was sent to Earth as a baby, Gokuu's sole purpose was to conquer and destroy the planet; but after suffering amnesia from a head injury, his violent and savage nature changed, and instead was raised as a kind and well-mannered boy, now fighting to protect others. With his failed attempt at forcibly recruiting Gokuu as an ally, Raditz warns Gokuu's friends of a new threat that's rapidly approaching Earth—one that could plunge Earth into an intergalactic conflict and cause the heavens themselves to shake. A war will soon be fought over the seven mystical Dragon Balls, magic objects that can grant any wish. Only the strongest will survive.

Piccolo is training at a barren cliff when a handful of mysterious enemies attacks and defeats him. These same enemies then go to Mount Paozu to steal Gohan Son's Dragon Ball. Upon arrival, not only do they defeat Gokuu Son's spouse and father-in-law—Chi-Chi and Gyumao, respectively—but they also kidnap Gohan in the process. Feeling something isn't right, Gokuu rushes home, only to find Chi-Chi lying on the ground as she explains the situation. He then goes to Kame House and borrows the Dragon Radar in order to locate the Dragon Balls and, with them, the enemies and Gohan.

The series stars Hat, the descendant of a hero who fought an evil king and sealed Devildom. Hat falls into Devildom and finds he has to defeat the evil king. (Source: AniDB)