Sasuke yawned as he crawled out of bed to turn off his alarm clock. He looked out his bedroom window and his mind began to wander. It had been two years since he'd been sent into this dimension. It was a punishment given to him by the Hidden Leaf Village for all of his crimes. Naruto wouldn't allow for his execution, so the village had come up with an alternative.
They had decided that Sasuke be sent to another world, a dimension where he could not harm the leaf ever again. Sasuke agreed, he wanted to atone for what he'd done. He was angry with himself. He'd wanted to end his own life because he hated himself. He welcomed the idea that Kakashi be the one to send him to another dimension with his mangekyou sharingan. For so long, Sasuke had thought he'd hated Kakashi, thought he'd hated everyone.
It took a long time and many terrible events that had happened before he realized he didn't hate anyone. He hated himself. He hated that he couldn't protect his clan, that he couldn't connect with Itachi, and that he couldn't achieve true power on his own.
It was because of this that he'd made friends with a man named Vegeta. Vegeta lived in this dimension, and Sasuke admired his pride and power. He yearned to get to know this man. However, once he became more familiar with Vegeta he realized they had a lot in common. Vegeta was angry with himself, with his abilities, because he never seemed to be able to surpass Goku. This inner turmoil reminded Sasuke of his own desire to surpass Naruto.
Naruto….he missed Naruto. After all, they had been best friends once. For now, he'd have to settle for Goku. Goku, a happy go lucky Saiyan. His attitude reminded Sasuke greatly of Naruto. His burning desire to fight, his compassion toward his friends, and his blatant idiocy.
Sasuke finished getting dressed and paused at his counter while he was on his way out of the door. As he always did, he stared at the wrinkled piece of paper that he'd put into a picture frame. It was a letter from Naruto that he'd had in his pocket when Kakashi had sent him here.
He turned away from the paper and walked out of the door. He made his way to Capsule Corporation, a building owned by Vegeta and his wife Bulma. He'd been invited to their son's twelfth birthday party. Their son's name was Trunks, he was also a Saiyan. A Saiyan, to Sasuke's understanding, was an extremely powerful alien. A being that would make even the hokages tremble with fear.
Goku, his wife Chichi, and their two sons Gohan and Goten were also there. Sasuke sat down in a lawn chair next to Vegeta. He was about to close his eyes and have a nap when, to his surprise, Vegeta spoke. Vegeta rarely talked to anyone, but today he said something to Sasuke that shocked him. "Sasuke. You seek more power don't you?" asked Vegeta. Hesitating, Sasuke replied "Well, yes." "I have an idea," Vegeta said, "Use the dragonballs to become a Saiyan and train with me."