It has been five peaceful years on Planet Earth since Goku defeated the reincarnation of the Demon King Piccolo. Vowing vengeance, Piccolo flew off to parts unknown to train for the fateful day he would get his rematch with Goku. Since winning the 23rd World Martial Arts Tournament, Goku used his prize money to buy a house and settled next to his childhood home on Mount Paozu. He also started a family with his bride, daughter of Ox-King, Chi-Chi. Gohan was now four years old, and Goku was eager to introduce him to all of his friends gathered on Master Roshi's island. However, the peaceful day was about to be changed in a disastrous way soon enough. In the deep recesses of space, a small spaceship was making its way towards Earth.
Piccolo was training in the northern snowcapped mountains in solitude. Piccolo has spent every day of the last five years training intensely. The demon king incarnate had become taller and more muscular in his five year hiatus from plans of world domination. Donning his trademark white cape, and cap Piccolo hurled some ki blasts at the mountains to refine his techniques. Five lonely years without a battle can cause one's skills to become rusty. That was not the case for Piccolo who had become even stronger during his isolation period. Piccolo also changed in a different way as well. He was no longer interested in world domination. That dream was King Piccolo's alone. Piccolo's only goal in life now was to kill Goku and take his place as the most powerful warrior on Earth.
All of a sudden, something seemed very wrong. Piccolo stopped his training and turned his attention towards the sky. "What the hell is that power I'm sensing?" Piccolo wondered to himself. "That can't be Goku can it? No, this power is pure evil.." Piccolo reasoned with himself. The sky came ablaze as the mysterious ship entered the atmosphere. It seemed the ship was heading away from Piccolo, but could see the ship as it crashed to the ground and caused a massive dust cloud. "I better investigate what that was." Piccolo thought to himself.
The ship had crashed into a field to the west of the snowy mountains. Inside the ship was a person. As the hinge of the ship opened, the person emerged from the ship. It was a man with a shocking similar physiology to a basic human. He was definitely from outer space because of the weird armor he was wearing. The man had long jet black hair, brown and black colored armor that extended over his shoulders and around his waist. He was also wearing a strange green computer like device over his left eye.
Seeing the smoke coming from his field, the farmer who lived there drove over to the crater in his pickup truck. The farmer got out of his truck with his shotgun to examine the gigantic hole. "Hey man! You crashed into my carrot patch! I got orders to fill what the hell is your problem?" The farmer yelled to the stranger.
"So this is Earth? How could Kakarot allow a pest like you to live?" The alien questioned the farmer. "Let's see what your power level is." Raditz said aloud as he pressed a button on his device. The computer on his face beeped and buzzed as it examined the farmer's strength. "The results are in! Let's see. A power level of five. How disappointing. I'll bet most of that comes from the shotgun." The stranger quipped to the farmer with a laugh.
"You're going to pay for what you did to my farm alien!" The farmer yelled as he fired a blast from his gun at the black haired warrior. The simple human was shocked to see that the bullets did not even make it to the alien who caught the bullets in his hand. He then rose out of the crater and took the shotgun out of the farmers hand and threw it to the side.
"Here's your bullet back friend." the sadistic stranger said as he flicked the bullet with his finger. The speed the bullet travelled was much faster than when the farmer used his shotgun. The metallic cylinder crashed through the farmer's chest cavity causing a torrent of blood to erupt from the human. The force of the impact also sent the human crashing into his truck. Not satisfied though, the alien used a small ki blast to cause the truck engine to explode and create a roaring fire.
"Now that I took care of that, I have to find Kakarot. I should use my scouter to scan this planet for the highest fighting powers. I'll bet he has the highest power on the planet." The alien said to himself unphazed by the fire around him. "There's six power levels above one hundred on this planet. Only two of them are above three hundred though. One of them has to be who I'm looking for." Raditz thought to himself as Piccolo landed in front of him.
"Who are you, and why have you come to Earth?" Piccolo questioned.
"Well this saves me the trouble of trying to figure out where Kakarot is. You are the second strongest warrior on this planet." The alien explained.
That statement clearly offended Piccolo. "What do you mean second strongest? I'll show you!" Piccolo roared as he launched a massive ki wave at his enemy. The blast caused thick stacks of black smoke to rise up from the surrounding land. Emerging from the smoke was the stranger completely unharmed.
"Wow your power rose to eight hundred with that attack. I'm impressed, but now you die here." The alien declared as he raised his right hand to prepare an energy wave that would surely destroy Piccolo. However, fate would shine on Piccolo as his opponent became distracted by his target's moving to a closer location. "Kakarot is moving somewhere. I must find him. Consider yourself lucky today green man." he arrogantly said to Piccolo.
"You have a tail like Goku did when he was a kid! Tell me your name first!" Piccolo demanded of the alien.
"I am Raditz and I'm looking for my long lost brother Kakarot. I'm leaving now." Raditz explained as he flew off chasing after his brother.
"His brother? Who could that be?" Piccolo wondered to himself. "Myself and Goku are the two strongest people on this planet. Wait a second! He's after Goku, but why did he call him that strange name?" Piccolo said trying to piece together Radtiz's motives.
Meanwhile, Goku left his house with his four year old son and was headed towards Master Roshi's island on the flying nimbus cloud. Gohan was dressed in a green and yellow outfit and on the top of his head sat the Four Star Dragon Ball that Goku once thought contained his grandfather's spirit. Goku was dressed in his trademark orange gi with Master Roshi's symbol on the front. He was also wearing a blue undershirt and brown boots.
Goku hadn't seen his friends since his victory over Piccolo and becoming Martial Arts Champion of Earth. Goku looked down at his son who was amazed at how fast they were flying and how crisp the air felt as they cruised above the clouds. "Gohan are you excited to meet my friends?" Goku questioned his son.
Gohan was giggling at the dragons they passed by and answered his father, "Are they nice daddy?"
"Of course son. I trust these people with my life." Goku answered back. "Also, they don't know that I have a son so I want to surprise them when we get there so stay behind my back Gohan." Goku asked of his little boy.
"Okay daddy!" Gohan said as his tail wagged in the breeze. Within a few hours the father and son had arrived at Kame House. They gently got off the nimbus cloud and knocked on the front door. Answering the door was a familiar looking snapping turtle.
"Goku is that you? Wow you've grown over since the last time I saw you." the old turtle said to the champion. Joining turtle on the front porch were Goku's old friends; Krillin and Bulma. Master Roshi then made his way up from the couch and walked over to Goku.
"Hello Goku. How have you been?" Master Roshi inquired.
"Hi everyone! I've been great. I'm excited to see you guys again it's been too long." Goku enthusiastically answered.
"Well that's because you haven't called in five years Goku." Krillin answered back.
"Krillin you know I don't know how to use a phone." Goku said with a laugh.
"How come Chi-Chi didn't come with you?" Bulma questioned.
"Well she had house work to do and her father stopped by the house. She did let me bring my son with me though." Goku said laughing and rubbing his head.
His friends fell to the floor in complete shock. The three of them shouted in unison, "Your son?" "But Goku do you know what that means?" Bulma asked as she examined the boy. Gohan was visibly nervous as the blue haired woman began to stare at him closely.
"What do you mean Bulma? One day I woke up and Gohan was a baby." Goku explained without a clue about how to make a baby.
"How come he has a tail Goku? Did he ever see the moon when it's full?" Bulma further asked.
"Well we go to bed pretty early Bulma, so he probably never even saw the moon." the world champion stated.
The longtime friends talked for a few more hours and caught up on what they had done over the last few years. Krillin and Master Roshi were content with living at Kame House watching exercise videos to pass the time. Bulma had an on and off again relationship with Yamcha, who was now playing baseball as a day job. Nobody seemed to hear from Tien and Chiaotzu, but they were probably training as usual. Gohan was outside playing with Turtle and various other sea creatures that washed up on the shores of the small island.
As the party began to wind down, Goku sensed an evil power heading towards them. "Oh no! Guys do you feel that power?" Goku asked Krillin and Master Roshi. The two had no idea what Goku was talking about and nodded their heads to disagree. "The power that's coming towards us is out of this world! I think it's even more powerful than I am!" Goku yelled as he ran outside. Roshi and Krillin joined him outside to get a better chance of sensing the power.
"Is that Piccolo coming to fight you Goku?" the old man asked his former student.
"No way Master Roshi. This power feels even more evil than King Piccolo or Piccolo Junior." The warrior explained.
"No way! How can someone be stronger than you and Piccolo? I don't get it Goku." Krillin shouted in disbelief.
"Well get ready guys because he's about to land. Gohan go in the house and hide right now!" Goku yelled as his son ran in the house to follow his order.
The powerful warrior landed on the island as everyone braced themselves for a battle. It was Raditz and he seemingly found the person he was looking for. "Hello, Kakarot. I've been waiting to see you for quite some time." Raditz explained to a shocked Goku.
"Who's Kakarot? My name is Goku." Goku sternly said back.
"Why don't you recognize your name? Why are you wearing those strange clothes? They aren't a fit for a Saiyan warrior like yourself." Raditz explained further shocking everyone on the island.
"What's a Saiyan? I'm a human. If you don't leave now I'll force you to leave!" Goku screamed as he took a fighting stance.
"That's no way to treat your brother! I've spent the last twenty years trying to find you Kakarot. You're coming with me so we can meet with the other two surviving Saiyans of our race." Raditz explained as he moved in towards Goku.
"I guess I have no choice to fight you then!" Goku roared raising his fist at his long lost brother.