The tittle says it.
Issue 1.This is only the main idea the real story is way way much than I posted.
It's a story of a Baby saiyan that was sent to Namek.
The saiyan that put this Baby in his space pod was surprised the baby's power increased 3 times more than usual for a short period so he put a time bomb in the pod hopefully the kid survived but lost his scouter which was controlling the kid's mind,A Namek raised this kid as his own son and trained him.
As soon as the evil saiyan realized that the kid was alive he rushed to Namek to end what he started.