From the introduction:
Saiya-jins are a race that came from space, a mission given to them either when an adult or as a child, to destroy where they landed to make profits. The Saiya-jins in D&D either forgot their mission, decide to go against it, or will go with it, but wanting to get their own possessions from the place first.
This race of Saiya-jin is unlike the other races, being a race and a class in itself.
This document presents a new race with supporting materials.