This story takes place 1 taon after the end of DBZ. Thats also 9 years before GT.

And so the story begins.
An alien race were screaming at the sight of a saiyan. One alien squealed, "Dont hurt us, saiyan! Please spare our people!" The saiyan seemed to have a kind puso and laughed, "You've got it all wrong. Im not the bad guy. Im a friend. So dont worry." The aliens released a breath of relief. The leader of the race walked towards the saiyan, "For sparing our race, I shall allow you to eat hapunan with me and my people for a feast." The saiyan's stomach growled, "Sweet. I can always go for fresh food."
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Later...

The saiyan ate plate after plate at the feast. The leader announced to the saiyan and his people, " Thanks to this kind hearted saiyan, We will continue
to live in peace. What is your name, saiyan?" The saiyan stopped eating pagkain for a segundo to talk, "My
name is Rentustu." The leader went back to his speech, "Rentustu! We Ukatranians are forever in
your dept." Rentustu laughed, "Its not such a big
deal! But about the dept thing, could you maybe
tell me where the planet called Earth is located?"
"Very well. I don't know much about the planet.
But I do know its located around here in the
North Galaxy." The leader replied. Rentustu thanked him, "So I must be close if its in the same galaxy as this planet? Sweet. Thanks. I'll probably
come to visit again one day! Well I'm off!" Rentustu walked to his pod. The leader wanted to thank him again also, "Thank you, saiyan! We'll see you soon!"
Rentustu waved and flew off in his pod. Rentustu searched for days till he finally found what he was seeking for, Planet Earth.
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Meanwhile...

"You gotta hit faster than that, Uub!" sinabi Goku as he dodged Uub's attacks while they were training. Uub stopped punching and started panting. Goku taunted, "C'mon Uub, I know you've got madami than that in you! Use your full strength!" Uub started punching and kicking. Goku continued to dodge, but then he got kicked in the gut. Goku smiled, "Good Uub. Your progessing faster than I thought you would." Uub smiled aswell. Goku was proud of him. Uub laughed, "Tha-" Before Uub could finish, he was interuppted sa pamamagitan ng a boom about 100 miles away. Goku looked concerned, "Someone could have gotten hurt! Or maybe its just Vegeta training with Trunks. That can get intense sometimes. Well we better check though." Uub nodded and they flew off towards the boom. In no time, they reached the spot of the sound. They saw a saiyan pod. Goku observed, the pod, "Yep. Theres a saiyan in there. I just don't know if he's a friend or foe." Uub smiled, "Lets check it out then, Goku." So they did. The door suddenly opened. Out came a saiyan with brown hair. He looked like a teenager. It was... Rentustu.
Rentustu looked surprised. He stared in amazement, "Its really you! Kakarot! Or as I heard you were called now, Goku! I heard you defeated Frieza and Majin Buu!" Goku laughed, " Heh, don't mean to brag but I guess that was me. You look pretty strong yourself." Rentustu looked pleased. He got in a fighting stance, "Please spar with me, Goku!" Goku smiled, "Okay lets go! I won't hold back! Uub, watch and learn!" Uub replied, "O-Okay!"
Rentustu powered up, "Lets go, Goku!" Rentustu charged Goku and started delivering multiple hits. But like he did with Uub, Goku dodged them. Rentustu smiled, "This is what I expect from you! But I have other tricks up my sleeves! Dragon Bullets!" Ren held out his arm. Red Ki waves shaped like daggers shot at Goku from Rentustu's palm. "Take that!" Rentustu yelled. As they hit Goku dust made him unseeable. But when the dirt faded, Goku was seeable and it appeared he didn't even have one scratch. Goku laughed, "It may not look like it, but that hurt! However, you still need some practice. So how bout you come train with me and Uub till the susunod tournament in three years?" Rentustu agreed, "Sure! It would be an honor to train under you! And I think it will be fun to train alongside you, Uub." Uub smiled and replied, "You too." Goku looked uneasy, "I need something to eat. Lets go ask Chi-Chi to make a hot warm hapunan for us. After that, our real training will begin."

The saiyan Rentustu has found someone to train him. Rentustu is ready for anything Goku can throw at him. However the teenage saiyan's real training has just begun.