Full blooded Saiyans are born with a specific hairstyle that cannot be changed. They have the appearance of a human with the exception of a tail. The Saiyans are a race of warriors who were born on 'Planet Vegeta'. In the main series, all male saiyans still alive after the Freeza Saga, with the exception of Radditz and Nappa (both of whom were are full-blooded Saiyans), manage to reach at least the first level during the course of the series. The appearance of a Super Saiyan is different in each form, more so in the fourth and final form. As saiyans trained during the Z series, they discovered levels beyond Super Saiyan never seen before, completely unheard of. The only certain condition to transcend initially to the Super Saiyan level is that a saiyan must be pure of heart, usually fiercely enraged, and of sufficient power. Though it was a legend, it, along with the saiyans constantly growing power, made Freeza, who was considered to be the strongest being in the universe at the time, feared the saiyans enough to destroy Planet Vegeta in the hope that the Super Saiyan legend would never be fulfilled.
The ability to become a Super Saiyan was once considered to be a myth, because it had not been performed for over a thousand years until Son Goku accomplished it when he was fighting Freeza on Planet Namek.
