Dragonball Comedy
Biography
Goku was sent to Earth as a baby. He was found by an old man named Gohan and was a rowdy child. However, one day Goku, being the stupid boy that he is, he fell off a cliff and bumped his head. He had amnesia and became a sweet, mild mannered boy. Goku was like all normal kids (except he had a tail). He was taught martial arts by master Gohan na dflew around on the flying Nimbus.
One day Goku transformed into Oozaru form and trampled on his dad. Being the dim witted fool that he is, he thought it was a monster and not him.
Anyway, later Goku met with Bulma and they went on a search for the dragonballs of legend. They had adventures getting them including learning the Kamehameha attack and encountering Yamcha, Puar and finally the bad guy Pilaf.
Of course Goku won and went on to fight in many martial arts tournaments where he met people like Krillin, Tien and Chiaotzu.
After all this, Goku evetually got married to Chi Chi and had a son called Gohan. Soon after, Goku found out he was a saiyan and his real name was Kakarrot and eventually battled his brother Radditz.
Goku died and went to King Kai and learned the Kaioken and Spirit Bomb attacks. When he came back he fought Nappa.
After this came the big fight - Goku vs Vegeta. Goku won but nearly died again in the process. While Goku was recovering, Gohan and Krillin went to Nameck to gather the Nameck Dragonballs to wish back their friends.
When Goku got better, he went after them, training under 100 times normal gravity. Goku beat the Ginyu force including Captain Ginyu, but Goku was severly battered in his fight with Ginyu. When recovering in the Saiyan recovery tank thing, Gohan, Krillin, Vegeta and Piccolo battled Frieza. Goku got better and started fighting Frieza and was getting wooped but turned Super Saiyan and killed Frieza.
Goku came back to Earth and trained in preparation for the Androids but during his battle he got a heart attack.
Goku eventually gets better and goes on to be the first Super Saiyan Level 3 and then gets turned into a small kid by a wish. He then goes on to become Super Saiyan Level 4 and fuses with Vegeta often to be Veggeto and Gogeta
The Alternative Theory
Goku is the man. He ALWAYS kicks everyones ass. But he's sooooo incredibly stupid its hard to believe he's still alive. With every major threat, Goku seems to disapear when they arrive and then comes back when all his pals are in big shits.
Goku secretly is a bad guy and is taking over the world from the inside. He lets the bad guys who attack the earth force kill all the major players and then he kills the bad guys so that he no longer has a threat.
But being the fool that he is, he forgets that the dragonballs are around and the rest of the people use them to wish back his "fallen comrades". Goku's plan is foiled later on by his son Gohan who kicks his ass and then banishes Goku so that he can be Emporer of the universe. Goku was last seen on an asteroid eating Pot Noodles and saying "i coulda been a contender".