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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. 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. He reveals that Gokuu is a warrior from the once powerful but now virtually extinct Saiyan race, whose homeworld was completely annihilated. This changes, however, with the arrival of a mysterious enemy named Raditz who presents himself as Gokuu's long-lost brother. Five years after winning the World Martial Arts tournament, Gokuu is now living a peaceful life with his wife and son.
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