"I am the hope of the Universe. I am the answer to all living things who cry out for peace. I am protector of the innocent. I am the light in the darkness. I am truth... ally to good, nightmare to you." - Goku
The Super Sayian known as Goku was sent to destory the earth as a child but hit his head and forgot his purpose and became the guardian of the earth. Goku has one son named Gohan and a wife whom he met at a very young age named Chi Chi.
With hard work and determination and rigorous training Goku became the most powerful being in the universe. Goku has many forms known as Super Sayian where his power increases 100 times each level. There are 5 levels ending with Sayian God.