This is the story of our hero. Goku the saiyjin with out a tail.
Goku was sent to earth, as a small boy, with instructions to destroy the planet. However his ship crashed and he lost his memory. An old man named Gohan stumbled upon this small boy with a tail, and adoped him. Goku, due to the dragon balls, met up with Bulma, Krillen, and the others.
A the begining of the DBZ series we find Goku has married a girl he met as a boy named Chichi. They had a son who he named after his (adoped) Grand Father Gohan. Goku and his friends were having a reunion when who should arrive but his brother Raddiz. Raddiz tells Goku thet he's a saiyjin and he must help Raddiz and the others destroy Freeza. When Goku refuses the battel begins.
And here are some images of our hero