The Saiyans

The Saiyan race

Los Saiyajin (サ イ ヤ 人, Saiya-jin), also known as Saiyans oSaiyanos, are the race's strongest warriors that exists in the series Dragon Ball, they inhabited the Planet Vegeta until its destruction at the hands of Freezer.

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Because of the fear of it to the legend of the Super Saiyan were true. In total nearly all Saiyans were prepared exclusively for the war and its best feature was the resistance demonstrated on several occasions. 

They play a central role in Dragon Ball Z, Dragon Ball GT and Dragon Ball Super, once it is revealed that the protagonist Goku is actually a Saiyan who was sent to destroy Earth. 

Saiyans also exist in the Universe 6, but are not evil like their counter-parts and have evolved beyond.

Zaiko Son Goku

Zaiko

Many do not know of the existence of third son of Goku, but it is a fact that genetically Zaiko son would be the most powerful and dangerous at the same time will also have to defend the land.

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The origin of Zaiko to been one of the most emblematic songs of DBAF, is a character who gave us understand an incoherent story in the manga and giving us confusion of his designs

His supposed "story" told by the same in the manga, they cite is Goku's son, and son of the supreme Kaioshin the west, a saiyan / Kaioshin hybrid obviously spoken by the "definitive be"