The saiya-jins used some of the tsufuru-jin technology to become the strongest race in the universe. The strongest being in the universe, Freeza, an evil creature, used the saiya-jins as mercenaries to take over planets for him and sell them. One day, the saiya-jins got tired of working for Freeza, so the king, King Vegeta, revolted with several of his loyal men. Unfortunately, he was killed along with his men. Freeza then destroyed Planet Vegeta in one giant blast, along with the entire saiya-jin race. Only a few saiya-jins survived, including Kakarotto (Goku), Prince Vegeta, Raditzu, Nappa, Taurus, Paragus and Brolli.
This is the typical appearance of a saiya-jin. A normal saiya-jin has black hair, a thick, strong, muscular body, and a unique tail. Saiya-jins have the excellent natural fighting ability that causes them to consume a great amount of calories daily. In order to provide these calories, they eat a lot. Goku, a low-class saiya-jin, consumes about 10 times the appetite a normal human would eat daily. Compared to humans, saiya-jins are extremely strong. Even when hit by a Bulma's car in the beginning of the Dragonball series, Goku was not hurt. He immediately stood up after he was hit.
Description: Freeza's worst fear... the Super Saiya-jin. This level is a legend early in Dragonball Z, but eventually becomes a natural form. Goku is the second person to ever reach this level, but is the first one we ever see doing it. When reaching this level the Saiya-jin's hair turns goldish blond, the eye's turn green, and his power level rises greatly. The Legendary SSJ mentioned throughout the series is Brolli. Super Saiya-jin are supposed to be ruthless killing machines, but we see that the Saiya-jin's personality barely changes after the transformation. The Super Saiya-jin level is triggered by emotional rage (usually). It can only be reached by someone with a pure heart of good or evil. Once reached the status of super saiya-jin, the Saiya-jin can go SSJ at will.
Those who achieved this form: Goku, Gohan, Vegeta, Trunks, Goten and Brolli